Implement callbacks that fire when animations complete, enabling direct
causality between animation end and game state changes. This eliminates
race conditions from parallel timer workarounds.
- Add optional callback parameter to Animation constructor
- Callbacks execute synchronously when animation completes
- Proper Python reference counting with GIL safety
- Callbacks receive (anim, target) parameters (currently None)
- Exception handling prevents crashes from Python errors
Example usage:
```python
def on_complete(anim, target):
player_moving = False
anim = mcrfpy.Animation("x", 300.0, 1.0, "easeOut", callback=on_complete)
anim.start(player)
```
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Co-Authored-By: Claude <noreply@anthropic.com>
