Ports a rewritten version of BAYSTRUMENTS (#11680)

* bay instruments

* k

* AAA

* remove that

* changes

* Update _instrument_key.dm

* safety nets

* @ghommie fixed

* volume

* Update item.dm

* Update item.dm

Co-authored-by: Ghom <42542238+Ghommie@users.noreply.github.com>

code/datums/action.dm

@@ -302,16 +302,6 @@
 			name = "Toggle Friendly Fire \[ON\]"
 	..()
 
-/datum/action/item_action/synthswitch
-	name = "Change Synthesizer Instrument"
-	desc = "Change the type of instrument your synthesizer is playing as."
-
-/datum/action/item_action/synthswitch/Trigger()
-	if(istype(target, /obj/item/instrument/piano_synth))
-		var/obj/item/instrument/piano_synth/synth = target
-		return synth.selectInstrument()
-	return ..()
-
 /datum/action/item_action/vortex_recall
 	name = "Vortex Recall"
 	desc = "Recall yourself, and anyone nearby, to an attuned hierophant beacon at any time.<br>If the beacon is still attached, will detach it."