RPG Fixes

- Should adress #1266
- Rockets are now w_class 3, which means they only fit on belts, inside
backpacks and large containers and possibly on suit storages, and no
longer in pockets or boxes
- Fixed problem with removing RPG from back, might have canned out
unloading RPGs manually
Merge pull request #1271 from dylanstrategie/RPG

RPG Fixes