Alpha Version 0.1

- Added enemies and two initial AI scripts.
- Added enemy shooting capabilities at varying intervals.
- Added basic collision
- Minor edits to existing code for clarity.

Notes:
- Possible implementation of recycling to reduce wasted memory,
primarily when creating new bullets and enemies.

Future Work:
- Expand AI scripts
- Add win and failure conditions.
- Add score and score update.
- Add obstacles.
- Add power-ups and upgrades if time permits.