Put the drone in a new category "Advanced Combat Drones".

RPG now also gets deleted when drones gets deleted from example by zeus

Fixed some bugs

Added hints for example if player does has a RPG to rearm it:
"You need a RPG-7".

Rocket now disapears when being fired and apears again when rearmed

Instead of a RPG item being placed next to it and then being attached. Now a RPG spawns within the init script of the drone itself. The RPG now can not be picked up by players anymore.

A visual RPG rocket is now loaded in the RPG and its no longer a empty RPG item.