Added several 'Salvage Upgrades': Scrap of destroyed vehicles that can be salvaged for parts and loot.

Added the Toxin Tractor, which contaminates the area with anthrax (it creates a field that damages your health)

- Changed the threatscore minimums
- added the (experimental) combat cycle for the early game

Added the GLA Battle Bus. An armored van that unleashes rockets and gunfire from its windows at all sides.
Ayayayaaaaa!

Changed the mod image and fixed a small mistake in a threat-level-threshold