[Fixed] Memory leak in KeyframedModel.dispose()

[Fixed] Memory leak in KeyframedModel.dispose()
[Changed] WrapMode for animators with additional 'SingleFrame' mode to only play 1 frame of animation then stop. This is to get models out of bind pose into a 'frozen idle' with very little performance cost.
[Changed] Added binary serialization of MD5Animation and MD5Model; intended for asset compiling usage.
[Fixed] Memory leak with TextureDict not disposing textures correctly when unloadAll() called.