delete all created windows
Makes combat boots weigh less than steeltoes.

Having worn both IRL, I can say for certain that combat boots weigh
less.
final fix of notes menu
change item::color_in_inventory to use item::color which has all the coloring code
-fixed typo in bitflag map, which prevented engine size from affecting engine power
-fixed a couple power checks that weren't going through part_power()
-removed power ratings from gas engines in vehicle_parts.json, since they are no longer used
-adjusted size ranges for gas engines
-ambulance, armored_car, and policecar now use engine_v8 instead of engine_v6
Merge a pile of bugfixes.