FlxTypedButton: Change callback type to Void->Void to avoid Reflection, remove FlxButtonEvent.callbackParams, closes #805
Remove remaining Dynamic's from FlxTypedButton, also use Void->Void for FlxSystemButton
Merge branch 'dev' of https://github.com/HaxeFlixel/flixel into ButtonCallback
FlxVirtualPad and VCR compatibility with button callback changes
Merge pull request #806 from Gama11/ButtonCallback

FlxTypedButton: Change callback type to Void->Void to avoid Reflection, closes #805