Added FlxG.safeDestroy - a function that checks for null before destroying an object. Added IDestroyable interface so it can be used with other stuff.
Removing inlines in FlxMath, better to be safe than sorry.
Reorganizing some stuff in FlxTypedGroup, because I'm OCD.
Making FlxSplash remember if user modified bgColor, fixedTimestep, and autoPause vars.
Extending FlxSpriteGroup functionality (added moves, origin, offset, drag, accelleration, velocity, maxVelocity properties) and improving general performance.