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>

_maps/map_files/BoxStation/BoxStation.dmm

@@ -11677,7 +11677,7 @@
 /turf/open/floor/plating,
 /area/maintenance/starboard/fore)
 "aAs" = (
-/obj/structure/piano{
+/obj/structure/musician/piano{
 	icon_state = "piano"
 	},
 /turf/open/floor/plating,
@@ -55621,7 +55621,7 @@
 	},
 /area/crew_quarters/theatre)
 "iTU" = (
-/obj/structure/piano{
+/obj/structure/musician/piano{
 	icon_state = "piano"
 	},
 /turf/open/floor/wood,
@@ -56804,7 +56804,7 @@
 /turf/open/floor/plating,
 /area/security/main)
 "myh" = (
-/obj/structure/piano,
+/obj/structure/musician/piano,
 /obj/structure/window/reinforced,
 /obj/machinery/atmospherics/pipe/simple/supply/hidden,
 /turf/open/floor/wood,