Fix bug causing a hang during mission generation.

Fixed bug where the destroy cache wasn't spawning.
Fixed bug in code that can cache enemy if needed.

. Feature: Add option to use a main base
Local Base: Vehicles and players respawn at the most recently captured objective (default)
Main Base: All vehicles and players will only spawn at main base. More realistic, but longer travel times.
. Feature: Destroy objective no longer exactly on marker
. Fix: Block arsenal loading (via 'load' button) of items not available in the arsenal
. Fix: Don't allow 'destroy' objective to be killed with a C4 or tank round
. Fix: CSLA vehicles don't appear if set to dlc
. Fix: load button in arsenal with DLCs needed adjusting (GM, WS, Contact, CSLA)

Fix tags