Add @since docs to some new API

[skip ci]

flixel/FlxCamera.hx

@@ -1526,6 +1526,7 @@ class FlxCamera extends FlxBasic
 	/**
 	 * Checks whether this camera contains a given point or rectangle, in
 	 * screen coordinates.
+	 * @since 4.3.0
 	 */
 	public inline function containsPoint(point:FlxPoint, width:Float = 0, height:Float = 0):Bool
 	{

flixel/FlxSubState.hx

@@ -10,15 +10,16 @@ import flixel.util.FlxColor;
  */
 class FlxSubState extends FlxState
 {
-	/**
-	 * Callback method for state close event.
-	 */
-	public var closeCallback:Void->Void;
-
 	/**
 	 * Callback method for state open/resume event.
+	 * @since 4.3.0
 	 */
 	public var openCallback:Void->Void;
+
+	/**
+	 * Callback method for state close event.
+	 */
+	public var closeCallback:Void->Void;
 
 	/**
 	 * Helper sprite object for non-flash targets. Draws the background.

flixel/group/FlxSpriteGroup.hx

@@ -257,6 +257,8 @@ class FlxTypedSpriteGroup<T:FlxSprite> extends FlxSprite
 	 * @param   Position The position that the new sprite or sprite group should be inserted at.
 	 * @param   Sprite   The sprite or sprite group you want to insert into the group.
 	 * @return  The same object that was passed in.
+	 *
+	 * @since 4.3.0
 	 */
 	public function insert(Position:Int, Sprite:T):T
 	{

flixel/math/FlxMatrix.hx

@@ -70,10 +70,12 @@ class FlxMatrix extends Matrix
 	 * @param	px	x coordinate of the point
 	 * @param	py	y coordinate of the point
 	 * @return	transformed x coordinate of the point
+	 *
+	 * @since 4.3.0
 	 */
 	public inline function transformX(px:Float, py:Float):Float 
 	{
-		return px * a + py * c + tx;	
+		return px * a + py * c + tx;
 	}
 
 	/**
@@ -83,9 +85,11 @@ class FlxMatrix extends Matrix
 	 * @param	px	x coordinate of the point
 	 * @param	py	y coordinate of the point
 	 * @return	transformed y coordinate of the point
+	 *
+	 * @since 4.3.0
 	 */
-	public inline function transformY(px:Float, py:Float):Float 
+	public inline function transformY(px:Float, py:Float):Float
 	{	
-		return px * b + py * d + ty;	
+		return px * b + py * d + ty;
 	}
 }