Added new Game Mode Last Survivor:
-There are no goal fields or spawn houses
-Some items are disabled
-Shop items cost 80% less
-Units start at random positions on the map
-Units stay dead
-When all units of a team are dead, the team is out!
-The team with the last units standing wins!
Fixes
Fixed entities still being clickable while dead
Fixed entities still rotating towards the camera when dead
Fixed shop items never restocking
Fixed health not getting set to 0 when an entity dies