[MIRROR] Adds keybinds for moving up/down z-levels (#4893)

* Adds keybinds for moving up/down z-levels (#58345)

* movin' on up

* removes unnecessary lines

* Adds keybinds for moving up/down z-levels

Co-authored-by: Ryll Ryll <3589655+Ryll-Ryll@users.noreply.github.com>

code/datums/keybinding/mob.dm

@@ -21,7 +21,7 @@
 	return TRUE
 
 /datum/keybinding/mob/swap_hands
-	hotkey_keys = list("X", "Northeast") // PAGEUP
+	hotkey_keys = list("X")
 	name = "swap_hands"
 	full_name = "Swap hands"
 	description = ""
@@ -36,7 +36,7 @@
 	return TRUE
 
 /datum/keybinding/mob/activate_inhand
-	hotkey_keys = list("Z", "Southeast") // Southeast = PAGEDOWN
+	hotkey_keys = list("Z")
 	name = "activate_inhand"
 	full_name = "Activate in-hand"
 	description = "Uses whatever item you have inhand"

code/datums/keybinding/movement.dm

@@ -29,3 +29,31 @@
 	full_name = "Move East"
 	description = "Moves your character east"
 	keybind_signal = COMSIG_KB_MOVEMENT_EAST_DOWN
+
+/datum/keybinding/movement/zlevel_upwards
+	hotkey_keys = list("Northeast") // PGUP
+	name = "Upwards"
+	full_name = "Move Upwards"
+	description = "Moves your character up a z-level if possible"
+	keybind_signal = COMSIG_KB_MOVEMENT_ZLEVEL_MOVEUP_DOWN
+
+/datum/keybinding/movement/zlevel_upwards/down(client/user)
+	. = ..()
+	if(.)
+		return
+	user.mob.up()
+	return TRUE
+
+/datum/keybinding/movement/zlevel_downwards
+	hotkey_keys = list("Southeast") // PGDOWN
+	name = "Downwards"
+	full_name = "Move Downwards"
+	description = "Moves your character down a z-level if possible"
+	keybind_signal = COMSIG_KB_MOVEMENT_ZLEVEL_MOVEDOWN_DOWN
+
+/datum/keybinding/movement/zlevel_downwards/down(client/user)
+	. = ..()
+	if(.)
+		return
+	user.mob.down()
+	return TRUE