DebuggerFontEnd: fix null reference errors on mobile targets
SoundFontEnd: fix missing import and var initialization
Merge pull request #490 from Gama11/dev_debugger

DebuggerFontEnd: fix null reference errors on mobile targets
Merge pull request #491 from Gama11/dev_sound

SoundFontEnd: fix missing import and var initialization
Merge pull request #492 from Gama11/dev_cleanup

More cleanups
Start work on separation of animation from sprite

(nothing is working)
Added setting to FlxG to enable antialisating by default.
Merge branch 'dev' of https://github.com/HaxeFlixel/engine into dev
revert to just Dynamic
Cleaning up initialization logic in MouseInteractionMgr
Moving bitmap textfield classes to more appropriate packages.
Merge remote-tracking branch 'origin/dev' into dev
revert OnClick callback to Dynamic for PxButton