Fixes a ton of shit with riding_datums

code/modules/mob/living/carbon/human/human.dm

@@ -911,8 +911,7 @@
 		M.visible_message("<span class='warning'>[M] really can't seem to mount [src]...</span>")
 		return
 	if(!riding_datum)
-		riding_datum = new /datum/riding/human
-		riding_datum.ridden = src
+		riding_datum = new /datum/riding/human(src)
 	if(buckled_mobs && ((M in buckled_mobs) || (buckled_mobs.len >= max_buckled_mobs)))
 		return
 	if(buckled)	//NO INFINITE STACKING!!

code/modules/mob/living/carbon/human/human_movement.dm

@@ -55,6 +55,9 @@
 				//End bloody footprints
 
 				S.step_action()
+
+/mob/living/carbon/human/Moved()
+	. = ..()
 	if(buckled_mobs && buckled_mobs.len && riding_datum)
 		riding_datum.on_vehicle_move()
 

code/modules/mob/living/living.dm

@@ -31,6 +31,7 @@
 		ranged_ability.remove_ranged_ability(src)
 	if(buckled)
 		buckled.unbuckle_mob(src,force=1)
+	QDEL_NULL(riding_datum)
 
 	for(var/mob/living/simple_animal/drone/D in player_list)
 		for(var/image/I in staticOverlays)
@@ -915,3 +916,8 @@
 					  "[C] topples over [src]!", \
 					  "[C] leaps out of [src]'s way!")]</span>")
 	C.Weaken(2)
+
+/mob/living/post_buckle_mob(mob/living/M)
+	if(riding_datum)
+		riding_datum.handle_vehicle_offsets()
+		riding_datum.handle_vehicle_layer()

code/modules/mob/living/living_defines.dm

@@ -75,3 +75,5 @@
 
 	var/list/implants = null
 	var/tesla_ignore = FALSE
+
+	var/datum/riding/riding_datum

code/modules/mob/living/silicon/robot/robot.dm

@@ -1010,8 +1010,7 @@
 		M.visible_message("<span class='warning'>[M] really can't seem to mount the [src]...</span>")
 		return
 	if(!riding_datum)
-		riding_datum = new /datum/riding/cyborg
-		riding_datum.ridden = src
+		riding_datum = new /datum/riding/cyborg(src)
 	if(buckled_mobs)
 		if(buckled_mobs.len >= max_buckled_mobs)
 			return

code/modules/mob/living/simple_animal/simple_animal.dm

@@ -540,11 +540,10 @@
 	if(tame && riding_datum)
 		riding_datum.handle_ride(user, direction)
 
-/mob/living/simple_animal/Move(NewLoc,Dir=0,step_x=0,step_y=0)
+/mob/living/simple_animal/Moved()
 	. = ..()
 	if(riding_datum)
-		riding_datum.handle_vehicle_layer()
-		riding_datum.handle_vehicle_offsets()
+		riding_datum.on_vehicle_move()
 
 
 /mob/living/simple_animal/buckle_mob(mob/living/buckled_mob, force = 0, check_loc = 1)