Gangs rework, and some bug fixes

- Deleted files (functionality moved around, or reworked)
   * gangfunctions.sqf, gangflags.sqf, gangs.sqf, gangsserverloop.sqf, itemprocess.sqf
- Reworked the gangs feature, to and refactory the logic into functions, most of it is now in Awesome/Functions/gang_functions.sqf
	 * gangs_get_list, gangs_update_list, gang_remove_member, gang_add_member, gangs_lookup_player_uid, etc
- Removed the server loop that takes care of deleting empty gangs (gang removal is now event driven)
- Removed global variables associated with gangs, and gang activity
   * gangleader, gangmember, gang_array_name, gang_array_members, gangsarray
- Added button to gang management menu for making another player be the gang leader
- Changed the gang open/close UI to use a checkbox, instead of a list with a button
- Fixed actions for gang shops 2, and 3 so that they show the actual gang shop items (weapons, etc), not jus drugs
- Improved the loading screen messages to show the progress while stats are being compiled
- Changed the way licenses are stored and modidifed and checked (New API)
   * [_player, _license] call player_has_license
   * [_player, _licenses] call player_add_licenses
   * [_player, _licenses] call player_remove_licenses