Rework of F3 Gear component:

* moved relevant files to new folder f/gear/
* renamed files to be consistent with the f_ naming scheme. Maybe use fa_ for the faction files?
* clients now send their required gear to the server via BIS_fnc_MP: Will work with JIP.
* new function: f_fnc_assignGearS - server-side component of assignGear.

NOTE:
* Comitting this would require slight adjustements in the fixes made to JIP.
* This changes the assignGear function's name to f_fnc_assignGear (from f_fnc_folk_assignGear). Adjustements in the mission.sqm have been made.