Change dayz_survived to actual play time

Vanilla commits:

18eaecb19f

b76b1200ca

78ea61e334

8309427f0d

Should be ready for Hive update @icomrade . If you upload it to a test
folder I'll test it.

SQF/dayz_code/system/scheduler/sched_medical.sqf

@@ -58,6 +58,8 @@ sched_medical = { // 1 second
 	} else {
 		[] spawn fnc_usec_playerHandleBlood;
 	};
+	
+	dayz_sessionTime = dayz_sessionTime + 1;
 
 	[_unconHdlr]
 };