Refactors Mousepointers + Code improvements (#29960)

* blah

* tweaks

* refactor

* awesome

* put everything in mouse_icons folder

* make spells work

* update twin

* tweak

* woop woop

* remove dynamic mousepointers

* bam

code/game/gamemodes/cult/blood_magic.dm

@@ -271,7 +271,7 @@
 	return TRUE
 
 /datum/spell/horror
-	ranged_mousepointer = 'icons/effects/cult_target.dmi'
+	ranged_mousepointer = 'icons/mouse_icons/cult_target.dmi'
 	var/datum/action/innate/cult/blood_spell/attached_action
 
 /datum/spell/horror/Destroy()

code/game/gamemodes/malfunction/Malf_Modules.dm

@@ -490,7 +490,7 @@
 	desc = "Overheats a machine, causing a moderately-sized explosion after a short time."
 	action_icon_state = "overload_machine"
 	uses = 4
-	ranged_mousepointer = 'icons/effects/cult_target.dmi'
+	ranged_mousepointer = 'icons/mouse_icons/cult_target.dmi'
 	selection_activated_message = "<span class='notice'>You tap into the station's powernet. Click on a machine to detonate it, or use the ability again to cancel.</span>"
 	selection_deactivated_message = "<span class='notice'>You release your hold on the powernet.</span>"
 
@@ -531,7 +531,7 @@
 	desc = "Animates a targeted machine, causing it to attack anyone nearby."
 	action_icon_state = "override_machine"
 	uses = 4
-	ranged_mousepointer = 'icons/effects/override_machine_target.dmi'
+	ranged_mousepointer = 'icons/mouse_icons/override_machine_target.dmi'
 	selection_activated_message = "<span class='notice'>You tap into the station's powernet. Click on a machine to animate it, or use the ability again to cancel.</span>"
 	selection_deactivated_message = "<span class='notice'>You release your hold on the powernet.</span>"
 
@@ -888,7 +888,7 @@
 	desc = "Shocks a cyborg back to 'life' after a short delay."
 	action_icon_state = "overload_machine"
 	uses = 2
-	ranged_mousepointer = 'icons/effects/overload_machine_target.dmi'
+	ranged_mousepointer = 'icons/mouse_icons/explode_machine_target.dmi'
 	selection_activated_message = "<span class='notice'>Call to address 0FFFFFFF in APC logic thread, awaiting user response.</span>"
 	selection_deactivated_message = "<span class='notice'>APC logic thread restarting...</span>"
 	var/is_active = FALSE
@@ -934,7 +934,7 @@
 	name = "Roll Over"
 	action_icon_state = "roll_over"
 	desc = "Allows you to roll over in the direction of your choosing, crushing anything in your way."
-	ranged_mousepointer = 'icons/effects/cult_target.dmi'
+	ranged_mousepointer = 'icons/mouse_icons/cult_target.dmi'
 	selection_activated_message = "<span class='notice'>Your inner servos shift as you prepare to roll around. Click adjacent tiles to roll into them!</span>"
 	selection_deactivated_message = "<span class='notice'>You disengage your rolling protocols.</span>"
 	COOLDOWN_DECLARE(time_til_next_tilt)

code/game/mecha/combat/combat.dm

@@ -5,24 +5,17 @@
 	armor = list(MELEE = 30, BULLET = 30, LASER = 15, ENERGY = 20, BOMB = 20, RAD = 0, FIRE = 100)
 	destruction_sleep_duration = 4 SECONDS
 
-/obj/mecha/combat/moved_inside(mob/living/carbon/human/H as mob)
+/obj/mecha/combat/moved_inside(mob/living/carbon/human/H)
 	if(..())
-		if(H.client)
-			H.client.mouse_pointer_icon = file("icons/mecha/mecha_mouse.dmi")
-		return 1
-	else
-		return 0
+		H.add_mousepointer(MP_MECHA_PRIORITY, 'icons/mouse_icons/mecha_mouse.dmi')
+		return TRUE
 
-/obj/mecha/combat/mmi_moved_inside(obj/item/mmi/mmi_as_oc as obj, mob/user as mob)
+/obj/mecha/combat/mmi_moved_inside(obj/item/mmi/mmi_as_oc, mob/user as mob)
 	if(..())
-		if(occupant.client)
-			occupant.client.mouse_pointer_icon = file("icons/mecha/mecha_mouse.dmi")
-		return 1
-	else
-		return 0
-
+		occupant.add_mousepointer(MP_MECHA_PRIORITY, 'icons/mouse_icons/mecha_mouse.dmi')
+		return TRUE
 
 /obj/mecha/combat/go_out()
-	if(occupant && occupant.client)
-		occupant.client.mouse_pointer_icon = initial(occupant.client.mouse_pointer_icon)
+	if(occupant)
+		occupant.remove_mousepointer(MP_MECHA_PRIORITY)
 	..()

code/game/objects/items.dm

@@ -1076,3 +1076,6 @@ GLOBAL_DATUM_INIT(welding_sparks, /mutable_appearance, mutable_appearance('icons
 	if(iscarbon(user))
 		var/mob/living/carbon/C = user
 		C.update_hands_hud()
+
+/obj/item/proc/on_hands_swap(mob/user, in_active_hand)
+	return