Deletes a file or a directory given a path.

This function's path is relative to the project root folder but it can also accept absolute paths.

All file separators should be forward ones "/" (Unix style).

	// creates a menu entry to remove a file or a directory.
	@MenuItem ("Example/Remove Something")
	static function RemoveAFile () {
		//removes the file
		FileUtil.DeleteFileOrDirectory("yourpathtothefolderorfile");
	}