Rework of the gang, and gang areas logic, and dialog, and bug fixes

- Deleted files (functionality moved around, or reworked)
* gangfunctions.sqf, gangflags.sqf, gangs.sqf, gangsserverloop.sqf,
itemprocess.sqf

- 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

- Remove global variables associated with gangs, and gang activity
* gangleader, gangmember, gang_array_name, gang_array_members,
gangsarray

- Removed the server loop that takes care of deleting empty gangs
- Empty gangs are now deleted event-driven (when last player of the gang
leaves the gang or disconnects)
- Added API for gang, and gang area related actions, in
Awesome/Functions/gang_functions.sqf
* gangs_get_list, gangs_update_list, gang_remove_member,
gang_add_member, gangs_lookup_player_uid, etc

- UIDs when used in the context of gangs is not the same as player UID
- The UIDs in the gang members list is calculated with function:
[_player] call gang_player_uid
- Added method for checking if player is in a gang: [_player] call
player_gang_member
- 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
Fix animation not playing while capturing gang area

I had this disabled while to make it easier during testing
Remove unneeded stats activity log messages from the servers's RPT

I was using this for debugging, but it's not needed in the server
Merge remote-tracking branch 'origin/master' into gangs-rework
Fix gang leader not being assigned correctly

The gang leader was not being set correctly when players would leave the
gang, or if the current leader left the gang
Cleanup comments
Change logic so that variables initialzied with stats_init_variable are tracked

Move the variables list tracking so that variables initialzied with
stats_init_variable are also tracked.
Fix bug in vehicle loading where function could exit early
Fix defect with clothes shop checking for empty string license
Add two extra options to admin menu

Add option in admin menu for setting an extra custom line in the
server's motd message.
Add option in the admin menu for deleting Man objects. This is useful
for when the clothes switching bugs out, and the old AI player stays.
Also reformatted the code in the admin menu to align the otions with
single tab.
Fix problem with gang leader not being assigned correctly

Refactored the code that assigns the gang leader so that leader is
reassigned whenever anyone enters or leaves the gang
Merge pull request #33 from micovery/gangs-rework

Gangs rework, and some bug fixes