Tank Mod Series 3

[chaosvolt]

This is the final component of the split-up mod, the mapgen hax. This is
also what'll be needed to alow forklifts to exist outside debug.

1. Ranch camp garage override, to allow a chance of a tractor spawning
   in it.
2. Bandit cabin override to allow a motorcycle, technical, or bandit
   bulldozer to spawn outside.
3. Bandit camp overrides, rearranging the layout to allow one of the
   vehicles to randomly be a technical or bulldozer instead, as well as
   making enough room to drive it out.
4. Home improvement superstore's back room override, to allow a forklift
   to spawn.
5. Mall loading bay override, to allow spawning a forklift.
6. Warehouse override, to allow a forklift.

[chaosvolt]

As usual, feedback would be appreciated, especially if the mapgen changes break anything that I've yet to notice.

[chaosvolt]

Just discovered a vehicle group derp to fix.

[chaosvolt]

Whee. And thank you for the merge.