Introduce IPath<T> interface for easier code reuse

[devlead]

Currently, DirectoryPath and FilePath shares several properties and methods typed so can't be in the base class, an IPath<T> interface with type parameter would make it easier to write shared logic between files and directories

Methods / Properties that can be shared:

• string FullPath { get; }
• bool IsRelative { get; }
• bool IsUNC { get; }
• char Separator { get; }
• string[] Segments { get; }
• string ToString();
• T MakeAbsolute(ICakeEnvironment environment);
• T MakeAbsolute(DirectoryPath path);
• T Collapse();
• public T GetRelativePath(T to);

[cake-build-bot]

🎉 This issue has been resolved in version v2.1.0 🎉

The release is available on:

• GitHub Release
• NuGet Package
• Chocolatey Package
• .Net Global Tool

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