N°3526 - Clean up pass on UIBlocks

- Move UIBlock::ENUM_BLOCK_FILES_TYPE_XXX to iUIBlock
- Add PHPDoc
- Remove Object return type hint on overloadable methods
- Add scalar return type hint
- Add type hint on parameters

sources/application/UI/Base/Component/Button/ButtonURL.php

@@ -45,9 +45,9 @@ class ButtonURL extends Button
 	public const DEFAULT_TARGET = self::ENUM_TARGET_SELF;
 
 
-	/** @var string $sURL */
+	/** @var string */
 	protected $sURL;
-	/** @var string $sTarget */
+	/** @var string */
 	protected $sTarget;
 
 	/**