Typed FlxSignal
Added some more functions to FlxSignal
Added FlxSignal3 and FlxSignal4
Delete extra spaces
Minor changes
Remove old FlxSignal
Minor fixes
Update tests for the new typed FlxSignal
move FlxSignal to flixel.signal package
Separate add() and addOnce() again
Update unit tests for FlxSignal's changed package
Merge branch 'dev' of https://github.com/HaxeFlixel/flixel into new_signal
Merge branch 'dev' of https://github.com/HaxeFlixel/flixel into new_signal
Make use of the updated FlxDestroyUtil.destroyArray()
Merge pull request #969 from kevinresol/new_signal

Typed FlxSignal