Cleaning up SpaceLevel.
Cleaning up Bullet.
Simplifying code to reflect only one bullet in use for ship.
Refactoring update logic for asteroid field.
Fixing ship color.
Renaming GenExplosionField to GenerateExplosionField
Renaming variables.
Removing unused variable. Simplifying GetWorld logic for Asteroid.
Renaming and cleaning up Explosions -> Fragment.
Renaming largeAsteroidModel to just asteroidModel.
Re-enabling explosion calls.
Resolving merge conflict.