Added stim packs to marines
Merge branch 'squad-2' of github.com:rarosu/FnulAI into stim
Added stim pack support

Marines and firebats now use stim packs when all criteria are satisfied.
Those criteria are:
- An enemy is within weapon range
- The squad they're in has at least one medic
- They are not currently affected by a stim pack
Must fix response squad erase
Merge branch 'stim' of github.com:rarosu/FnulAI into squad-2
Basic defensive strategy working