Refactore draw methods for some classes

Affected
* FlxSprite.draw
* FlxTileblock.draw
* FlxSkewedSprite.draw
* FlxBar.draw
* photonstorm/FlxBitmapFont.draw
* photonstorm/fx/GlitchSprite.draw
* photonstorm/fx/StarSprite.draw
* pxText/FlxBitmapTextField.draw

I tested on following demos:
* FlixelBunnyMark (also on my computer no changes in performance)
* ParticlesDemo
* ParticlesExt
* Photonstorm-Breakout
* SkewedSprite
* SpaceWar
* TilemapDemo