Jukebox TGUI update, Earphones autoplay, sound keys refactor (#21630)

V2 of [previous music playing
PR](https://github.com/Aurorastation/Aurora.3/pull/21466). TLDR no
longer uses the connect_range component for implementation because it
turned out a bit too inflexible for overlapping music players.

Removes a NanoUI template for the [TGUI
update](https://github.com/Aurorastation/Aurora.3/pull/21046).

New changelog:
  - refactor: "Ported Jukebox's NanoUI interface to TGUI."
- refactor: "Ported Jukebox audio playing functionality to a component."
- refactor: "Sound keys refactored from singletons to datums, along with
larger breakout of sound.dm to allow for easier SFX updates in future."
  - code_imp: "Expanded track datums to include track lengths."
- code_imp: "Reorganized music file folders for more intuitive access."
  - rscadd: "Earphone status feedback text now includes track length."
  - rscadd: "Added autoplay functionality to earphones."
- bugfix: "Fixed earphones' 'Previous Song' verb not sending you to the
end of the playlist when used while the first track is selected."
- bugfix: "Fixed gain adjustment for 'Konyang-1' (-23 dB -> standard
-9.8 dB)."
- bugfix: "Fixed y-offset of audioconsole-running overlay animation to
line up with the actual screen."

---------

Co-authored-by: VMSolidus <evilexecutive@gmail.com>

code/game/objects/structures/fluff/engineering/maintenance.dm

@@ -92,7 +92,7 @@ ABSTRACT_TYPE(/obj/structure/engineer_maintenance)
 		user.visible_message("[SPAN_BOLD("[user]")] [panel_open ? "closes" : "opens"] \the [src]!", SPAN_NOTICE("You [panel_open ? "close" : "open"] \the [src]!"))
 		panel_open = !panel_open
 		update_icon()
-		playsound(get_turf(src), panel_open ? /singleton/sound_category/hatch_open : /singleton/sound_category/hatch_close, 30, TRUE)
+		playsound(get_turf(src), panel_open ? SFX_HATCH_OPEN : SFX_HATCH_CLOSE, 30, TRUE)
 		return
 	if(panel_open)
 		for(var/tool_type in panel_tools)
@@ -221,13 +221,13 @@ ABSTRACT_TYPE(/obj/structure/engineer_maintenance)
 		playsound(get_turf(target), finish_sound, 30, TRUE)
 
 /singleton/engineer_maintenance_tool/steam_pipe
-	finish_sound = /singleton/sound_category/steam_pipe
+	finish_sound = SFX_STEAM_PIPE
 
 /singleton/engineer_maintenance_tool/electrical_hum
-	finish_sound = /singleton/sound_category/electrical_hum
+	finish_sound = SFX_ELECTRICAL_HUM
 
 /singleton/engineer_maintenance_tool/electrical_spark
-	finish_sound = /singleton/sound_category/electrical_spark
+	finish_sound = SFX_ELECTRICAL_SPARK
 
 /singleton/engineer_maintenance_tool/electrical_spark/perform_action(mob/user, obj/item/tool, obj/structure/engineer_maintenance/target)
 	. = ..()