Replaced world.tick_usage with TICK_USAGE macro in VOREStation code

code/controllers/subsystems/mobs.dm

@@ -22,7 +22,7 @@ SUBSYSTEM_DEF(mobs)
 /datum/controller/subsystem/mobs/fire(resumed = 0)
 	if (!resumed)
 		src.currentrun = mob_list.Copy()
-		if(log_extensively) timelog = list("-Start- [world.tick_usage]")
+		if(log_extensively) timelog = list("-Start- [TICK_USAGE]")
 
 	//cache for sanic speed (lists are references anyways)
 	var/list/currentrun = src.currentrun
@@ -37,9 +37,9 @@ SUBSYSTEM_DEF(mobs)
 			// Right now mob.Life() is unstable enough I think we need to use a try catch.
 			// Obviously we should try and get rid of this for performance reasons when we can.
 			try
-				var/time_before = world.tick_usage
+				var/time_before = TICK_USAGE
 				M.Life(times_fired)
-				var/time_after = world.tick_usage
+				var/time_after = TICK_USAGE
 				var/time_diff = time_after - time_before
 				if(log_extensively && (time_diff > 0.01)) timelog += list("[time_diff]% - [M] ([M.x],[M.y],[M.z])" = M)
 			catch(var/exception/e)

code/modules/holomap/generate_holomap.dm

@@ -80,7 +80,7 @@ var/global/list/extraMiniMaps = list()
 				else if(IS_PATH(tile))
 					canvas.DrawBox(HOLOMAP_PATH, x + offset_x, y + offset_y)
 		// Check sleeping after each row to avoid *completely* destroying the server
-		if(world.tick_usage >= 80) sleep(world.tick_lag * 0.2)
+		CHECK_TICK
 	return canvas
 
 // Okay, what does this one do?