Stock AH & vehicle spawning

[Darth_Rogue]

With the stock AH it does a good job of reading the loot table to see what weapons, magazines and items can be spawned into the world.  But for vehicles it does not consult the allowed vehicles list in epochconfig.hpp.  It goes off of its own hard-coded list.  This should be changed so that folks running vehicle addons, like RHS, can spawn in addon vehicles as needed with the admin tool.  

[vbawol]

This config will be moved to the settings pbo like we have with other previously hardcoded configs.