Paywalls: added MIT license to all headers (#3084)

`Xcode` doesn't allow customizing the header (looks like maybe it worked
at some point but not anymore:
https://stackoverflow.com/questions/67614785/changing-the-default-header-comment-license-in-swift-package).

At least this adds the license to all the initial files in the package.

RevenueCatUI/Data/Constants.swift

@@ -1,9 +1,15 @@
 //
+//  Copyright RevenueCat Inc. All Rights Reserved.
+//
+//  Licensed under the MIT License (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
+//
+//      https://opensource.org/licenses/MIT
+//
 //  Constants.swift
-//  
 //
 //  Created by Nacho Soto on 7/13/23.
-//
 
 import SwiftUI
 

RevenueCatUI/Data/Errors/PaywallError.swift

@@ -1,9 +1,15 @@
 //
+//  Copyright RevenueCat Inc. All Rights Reserved.
+//
+//  Licensed under the MIT License (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
+//
+//      https://opensource.org/licenses/MIT
+//
 //  PaywalError.swift
-//  
 //
 //  Created by Nacho Soto on 7/21/23.
-//
 
 import Foundation
 

RevenueCatUI/Data/Errors/TemplateError.swift

@@ -1,9 +1,15 @@
 //
+//  Copyright RevenueCat Inc. All Rights Reserved.
+//
+//  Licensed under the MIT License (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
+//
+//      https://opensource.org/licenses/MIT
+//
 //  TemplateError.swift
-//  
 //
 //  Created by Nacho Soto on 7/17/23.
-//
 
 import Foundation
 import RevenueCat

RevenueCatUI/Data/IntroEligibilityViewModel.swift

@@ -1,9 +1,15 @@
 //
+//  Copyright RevenueCat Inc. All Rights Reserved.
+//
+//  Licensed under the MIT License (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
+//
+//      https://opensource.org/licenses/MIT
+//
 //  IntroEligibilityViewModel.swift
-//  
 //
 //  Created by Nacho Soto on 7/26/23.
-//
 
 import RevenueCat
 import SwiftUI

RevenueCatUI/Data/Localization.swift

@@ -1,9 +1,15 @@
 //
-//  Localization.swift
+//  Copyright RevenueCat Inc. All Rights Reserved.
 //
+//  Licensed under the MIT License (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
 //
-//  Created by Nacho Soto on 7/20/23.
+//      https://opensource.org/licenses/MIT
 //
+//  Localization.swift
+//
+//  Created by Nacho Soto on 7/20/23.
 
 import Foundation
 import RevenueCat

RevenueCatUI/Data/LocalizedAlertError.swift

@@ -1,9 +1,15 @@
 //
-//  File.swift
-//  
+//  Copyright RevenueCat Inc. All Rights Reserved.
 //
-//  Created by Nacho Soto on 7/21/23.
+//  Licensed under the MIT License (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
+//
+//      https://opensource.org/licenses/MIT
 //
+//  LocalizedAlertError.swift
+//
+//  Created by Nacho Soto on 7/21/23.
 
 import RevenueCat
 import SwiftUI

RevenueCatUI/Data/PaywallData+Validation.swift

@@ -1,9 +1,15 @@
 //
+//  Copyright RevenueCat Inc. All Rights Reserved.
+//
+//  Licensed under the MIT License (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
+//
+//      https://opensource.org/licenses/MIT
+//
 //  PaywallData+Validation.swift
-//  
 //
 //  Created by Nacho Soto on 8/15/23.
-//
 
 import RevenueCat
 

RevenueCatUI/Data/PaywallViewMode+Extensions.swift

@@ -1,9 +1,15 @@
 //
+//  Copyright RevenueCat Inc. All Rights Reserved.
+//
+//  Licensed under the MIT License (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
+//
+//      https://opensource.org/licenses/MIT
+//
 //  PaywallViewMode+Extensions.swift
-//  
 //
 //  Created by Nacho Soto on 8/9/23.
-//
 
 import RevenueCat
 

RevenueCatUI/Data/ProcessedLocalizedConfiguration.swift

@@ -1,3 +1,14 @@
+//
+//  Copyright RevenueCat Inc. All Rights Reserved.
+//
+//  Licensed under the MIT License (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
+//
+//      https://opensource.org/licenses/MIT
+//
+//  ProcessedLocalizedConfiguration.swift
+
 import Foundation
 import RevenueCat
 

RevenueCatUI/Data/Strings.swift

@@ -1,9 +1,15 @@
 //
+//  Copyright RevenueCat Inc. All Rights Reserved.
+//
+//  Licensed under the MIT License (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
+//
+//      https://opensource.org/licenses/MIT
+//
 //  Strings.swift
-//  
 //
 //  Created by Nacho Soto on 7/31/23.
-//
 
 import Foundation
 import RevenueCat

RevenueCatUI/Data/TemplateViewConfiguration+Images.swift

@@ -1,9 +1,15 @@
 //
+//  Copyright RevenueCat Inc. All Rights Reserved.
+//
+//  Licensed under the MIT License (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
+//
+//      https://opensource.org/licenses/MIT
+//
 //  TemplateViewConfiguration+Images.swift
-//  
 //
 //  Created by Nacho Soto on 7/25/23.
-//
 
 import Foundation
 import RevenueCat

RevenueCatUI/Data/TemplateViewConfiguration.swift

@@ -1,9 +1,15 @@
 //
+//  Copyright RevenueCat Inc. All Rights Reserved.
+//
+//  Licensed under the MIT License (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
+//
+//      https://opensource.org/licenses/MIT
+//
 //  TemplateViewConfiguration.swift
-//  
 //
 //  Created by Nacho Soto on 7/17/23.
-//
 
 import Foundation
 import RevenueCat

RevenueCatUI/Data/Variables.swift

@@ -1,3 +1,14 @@
+//
+//  Copyright RevenueCat Inc. All Rights Reserved.
+//
+//  Licensed under the MIT License (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
+//
+//      https://opensource.org/licenses/MIT
+//
+//   TestData.swift
+
 import Foundation
 import RegexBuilder
 import RevenueCat

RevenueCatUI/Helpers/ColorInformation+MultiScheme.swift

@@ -1,9 +1,15 @@
 //
+//  Copyright RevenueCat Inc. All Rights Reserved.
+//
+//  Licensed under the MIT License (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
+//
+//      https://opensource.org/licenses/MIT
+//
 //  ColorInformation+MultiScheme.swift
-//  
 //
 //  Created by Nacho Soto on 7/14/23.
-//
 
 import Foundation
 import RevenueCat

RevenueCatUI/Helpers/Logger.swift

@@ -1,9 +1,15 @@
 //
+//  Copyright RevenueCat Inc. All Rights Reserved.
+//
+//  Licensed under the MIT License (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
+//
+//      https://opensource.org/licenses/MIT
+//
 //  Logger.swift
-//  
 //
 //  Created by Nacho Soto on 7/12/23.
-//
 
 import RevenueCat
 

RevenueCatUI/Helpers/Package+VariableDataProvider.swift

@@ -1,3 +1,14 @@
+//
+//  Copyright RevenueCat Inc. All Rights Reserved.
+//
+//  Licensed under the MIT License (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
+//
+//      https://opensource.org/licenses/MIT
+//
+//  Package+VariableDataProvider.swift
+
 import Foundation
 import RevenueCat
 

RevenueCatUI/Helpers/PaywallData+Default.swift

@@ -1,9 +1,15 @@
 //
+//  Copyright RevenueCat Inc. All Rights Reserved.
+//
+//  Licensed under the MIT License (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
+//
+//      https://opensource.org/licenses/MIT
+//
 //  PaywallData+Default.swift
-//  
 //
 //  Created by Nacho Soto on 7/20/23.
-//
 
 import Foundation
 import RevenueCat

RevenueCatUI/Helpers/PreviewHelpers.swift

@@ -1,9 +1,15 @@
 //
+//  Copyright RevenueCat Inc. All Rights Reserved.
+//
+//  Licensed under the MIT License (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
+//
+//      https://opensource.org/licenses/MIT
+//
 //  PreviewHelpers.swift
-//  
 //
 //  Created by Nacho Soto on 7/29/23.
-//
 
 import RevenueCat
 import SwiftUI

RevenueCatUI/Helpers/TrialOrIntroEligibilityChecker.swift

@@ -1,9 +1,15 @@
 //
+//  Copyright RevenueCat Inc. All Rights Reserved.
+//
+//  Licensed under the MIT License (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
+//
+//      https://opensource.org/licenses/MIT
+//
 //  TrialOrIntroEligibilityChecker.swift
-//  
 //
 //  Created by Nacho Soto on 7/13/23.
-//
 
 import Foundation
 import RevenueCat

RevenueCatUI/Helpers/VersionDetector.swift

@@ -1,9 +1,15 @@
 //
+//  Copyright RevenueCat Inc. All Rights Reserved.
+//
+//  Licensed under the MIT License (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
+//
+//      https://opensource.org/licenses/MIT
+//
 //  VersionDetector.swift
-//  
 //
 //  Created by Nacho Soto on 8/17/23.
-//
 
 import Foundation
 

RevenueCatUI/Modifiers/FitToAspectRatio.swift

@@ -1,9 +1,15 @@
 //
+//  Copyright RevenueCat Inc. All Rights Reserved.
+//
+//  Licensed under the MIT License (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
+//
+//      https://opensource.org/licenses/MIT
+//
 //  FitToAspectRatio.swift
-//  
 //
 //  Created by Nacho Soto on 7/13/23.
-//
 
 import Foundation
 import SwiftUI

RevenueCatUI/Modifiers/FooterHidingModifier.swift

@@ -1,9 +1,15 @@
 //
-//  FooterHidingModifier.swift
+//  Copyright RevenueCat Inc. All Rights Reserved.
 //
+//  Licensed under the MIT License (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
 //
-//  Created by Nacho Soto on 8/9/23.
+//      https://opensource.org/licenses/MIT
 //
+//  FooterHidingModifier.swift
+//
+//  Created by Nacho Soto on 8/9/23.
 
 import RevenueCat
 import SwiftUI