FlxUI: <load_if> tags can now be used as blocks, and also now work around or inside of all basic tags.
FlxUITabMenu: Refactored a bit
FlxUIText: Added failsafe for auto-expanding text to stop it from breaking onto a new line
FlxUITypedButton: Added nullability to up/over/down _color properties (very useful for when the label is a FlxSpriteGroup)