Added Stim Pack logic to the Marine Agent so all Marines will use it, not only the ones in the "Marine Squad" (will probably be removed in next commit)
Removed Marine Squad, will probably better to develop pure "strategy" squads instead of pure unit squads. I.e. a kiting squad, a defend squad etc.
Marines will now use Stim Pack without relation to what current health they have.
Updated with the removal of Marine Squad