Add group system

Initial commit, not tested in multiplayer yet. Some revisions still left
to do.

SQF/dayz_code/groups/disbandGroup.sqf

@@ -0,0 +1,21 @@
+private "_group";
+
+_group = group player;
+if (count (units _group) == 1 or (!isNil "dayz_groupDisbandThread" && {!scriptDone dayz_groupDisbandThread})) exitWith {
+	_this ctrlShow false;
+};
+
+dayz_groupDisbanded = nil;
+PVDZ_Server_UpdateGroup = [4,player];
+publicVariableServer "PVDZ_Server_UpdateGroup";
+
+dayz_groupDisbandThread = _group spawn {
+	//Wait for response from server to confirm group finished updating in DB
+	waitUntil {!isNil "dayz_groupDisbanded"};
+	
+	{
+		[_x] join grpNull;
+	} count (units _this);
+
+	deleteGroup _this;
+};