Takeoff a3

-Added health & ammo packs which were not there before (whoops!)
-Buildings on mid are now taller to allow for better bombing with Soldier
-Added fences on mid dropdown to reduce long sightlines and make it harder for Sniper to hold that location
(Thanks Borat for the suggestions!)

-Added cubemaps for the water
-Changed the background rocket's prop type so it would show up