Initial commit of mod settings.
Mod Scaffolding.
Start marine with no weapons.
Add bandaid map for testing.
Add basic win/loss mechanics.

- Start when 3+ players in game.
- When there are 0 marines in the field, the aliens win.
- When the marines survive for 20 minutes, they win.
- Port utility code from skulks with shotguns.
Dead marines instantly turn into skulks.
Add marine join requirement pre-game, post game auto join aliens.

- After 3 people join marine team the game begins in 15 seconds.
- Automatically kill marines to generate the first aliens.
Disable default resource tower spawning.
Add a wide variety of weapon spawning at resource nodes. Largely untested.
Add item_spawn entity for item spawning.