Merge pull request #11340 from Ghommie/Ghommie-cit605

Porting movespeed modifiers code updates.

code/game/area/areas.dm

@@ -514,39 +514,6 @@ GLOBAL_LIST_EMPTY(teleportlocs)
 /client/proc/ResetAmbiencePlayed()
 	played = FALSE
 
-/atom/proc/has_gravity(turf/T)
-	if(!T || !isturf(T))
-		T = get_turf(src)
-
-	if(!T)
-		return 0
-
-	var/list/forced_gravity = list()
-	SEND_SIGNAL(src, COMSIG_ATOM_HAS_GRAVITY, T, forced_gravity)
-	if(!forced_gravity.len)
-		SEND_SIGNAL(T, COMSIG_TURF_HAS_GRAVITY, src, forced_gravity)
-	if(forced_gravity.len)
-		var/max_grav
-		for(var/i in forced_gravity)
-			max_grav = max(max_grav, i)
-		if(max_grav)
-			return max_grav
-
-	if(isspaceturf(T)) // Turf never has gravity
-		return 0
-
-	var/area/A = get_area(T)
-	if(A.has_gravity) // Areas which always has gravity
-		return A.has_gravity
-	else
-		// There's a gravity generator on our z level
-		if(GLOB.gravity_generators["[T.z]"])
-			var/max_grav = 0
-			for(var/obj/machinery/gravity_generator/main/G in GLOB.gravity_generators["[T.z]"])
-				max_grav = max(G.setting,max_grav)
-			return max_grav
-	return SSmapping.level_trait(T.z, ZTRAIT_GRAVITY)
-
 /area/proc/setup(a_name)
 	name = a_name
 	power_equip = FALSE