Adds a "synthesizer" that's basically a handheld piano (#29197)

* Update instruments.dm

* Update personal.dm

* Update personal.dm

* nicbn sprites

* icon pathing

code/game/objects/structures/crates_lockers/closets/secure/personal.dm

@@ -28,6 +28,7 @@
 
 /obj/structure/closet/secure_closet/personal/cabinet/PopulateContents()
 	new /obj/item/weapon/storage/backpack/satchel/leather/withwallet( src )
+	new /obj/item/device/instrument/piano_synth(src)
 	new /obj/item/device/radio/headset( src )
 
 /obj/structure/closet/secure_closet/personal/attackby(obj/item/W, mob/user, params)
@@ -49,4 +50,4 @@
 		else
 			to_chat(user, "<span class='danger'>Access Denied.</span>")
 	else
-		return ..()
+		return ..()