AI looses gear when killed by vehicle's plus some small fixes

Change list:
* Added NVG's
* AI killed be vehicle's will have no gear
* Change the mission announcement system only armed vehicle, for now is it something people want ?
* Made the system ready so loot in the box will only spawn if X % of AI is killed ?, need to make change in every mission file is the is going to work. can update armed vehicle if its something you want ?