Replace the alt click menu with the RPG Lootpanel (#17938)

* Port lootpanel without removing old obj panel

* Rip out the loot panel leaving examine tab intact

* some fixes

* we want nice icons

* that

* Switch to more robust hotkey detection

* Add a reminder to ctrl-r

---------

Co-authored-by: Kashargul <144968721+Kashargul@users.noreply.github.com>

code/game/objects/items.dm

@@ -397,6 +397,7 @@
 
 // called just as an item is picked up (loc is not yet changed)
 /obj/item/proc/pickup(mob/user)
+	SEND_SIGNAL(src, COMSIG_ITEM_PICKUP, user)
 	pixel_x = 0
 	pixel_y = 0
 	return