changed for loop to FAST_FOR, that is faster and also show a stacktrace when there is an error in the loop - instead of slient failure.
the old-style for loop can be still used by changing the class variable FAST_FOR to False in python_to_pythonjs.py
Pixi and Blockly, small fixes.
SpriteController can now trigger animation playback.
Pixi and Blockly: playback of multiple keyframes.
Pixi and Blockly: SpriteController - keypress can now trigger an animation.
Pixi and Blockly: SpriteController - now supports multiple if/do blocks.