Added the installer and fixed some bugs.

Added the installer.
Big fixes:
- Game crash after multiple playthroughs
- Asteroids glitching on the left side of the screen, when being pushed
in.
- Score tally at end not being correct and taking forever to end.
- Gamepad left stick movement works in all directions, 360 degrees of
motion.
- Intro loop started before intro finished.

Added:
- A bunch of explosions at the beginning screen. >:D
- Icons to the game.
- More explosions when the laser is being used.