add more configurable options for spawning

A3W_boxSpawning = 1;  // if spawning is enabled, also spawn ammo boxes
arround the map (0 = no, 1 = yes)
A3W_boatSpawning = 1;  // if spawning is enabled, also spawn boats near
marked areas at coasts (0 = no, 1 = yes)
A3W_baseBuilding = 1;  // if spawning is enabled, also spawn
basebuilding parts arround the map (0 = no, 1 = yes)
no backpack on spawn
changes to vehicle loot
change ration of military / lightmilitary veh