Make the mass driver a non-energy weapon.
Allow dretches to bite turrets.
Change turret fire pattern back to continuous.
Overload and improve G_LineOfSight. Fire doesn't spread through entities anymore.
Make turret continue to shoot as long as it has a LOS to the target's BBOX.

Previously, it would give up as soon as it lost LOS to the target's origin.
Remove the option to evolve to classes of same price for one evo.

This also fixes bots wasting their credits on evolving abck and forth.