Progression

Adds a bit of progression; stuff to unlock. Splits faction spawns by quadrant so that there's a progression of what you'll face in each quadrant.

Adds a cheat to switch ships
Ships now specify inventory size
Adds "Starmaster" from flythroughspace
Adds "Oathbreaker" ship
Adds "Lightning" ship
Adds "scout" ship
projectiles now push ships around
projectiles can now have a fade parameter to imitate EVN Blasters
All ships are faster now
Weapon slots can now be turreted
Upgrades to GD 4.2.1
Player dying now returns you to the menu

Still missing a few icons and textures, and probably some top end content, but we're getting there.