515 Compatibility (#19636)

* 515 compat

* double spaces

* Callback documentation, aa review

* spacing

* NAMEOF_STATIC

* big beta

code/modules/instruments/_instrument_data.dm

@@ -89,7 +89,7 @@
 	samples = list()
 	for(var/key in real_samples)
 		real_keys += text2num(key)
-	sortTim(real_keys, /proc/cmp_numeric_asc, associative = FALSE)
+	sortTim(real_keys, GLOBAL_PROC_REF(cmp_numeric_asc), associative = FALSE)
 
 	for(var/i in 1 to (length(real_keys) - 1))
 		var/from_key = real_keys[i]

code/modules/instruments/objs/items/headphones.dm

@@ -13,8 +13,8 @@
 	song.instrument_range = 0
 	song.allowed_instrument_ids = SSinstruments.synthesizer_instrument_ids
 	// To update the icon
-	RegisterSignal(src, COMSIG_SONG_START, .proc/start_playing)
-	RegisterSignal(src, COMSIG_SONG_END, .proc/stop_playing)
+	RegisterSignal(src, COMSIG_SONG_START, PROC_REF(start_playing))
+	RegisterSignal(src, COMSIG_SONG_END, PROC_REF(stop_playing))
 
 /obj/item/clothing/ears/headphones/Destroy()
 	QDEL_NULL(song)

code/modules/instruments/songs/_song_ui.dm

@@ -83,7 +83,7 @@
 		if("tempo")
 			tempo = sanitize_tempo(text2num(params["new"]))
 		if("play")
-			INVOKE_ASYNC(src, .proc/start_playing, usr)
+			INVOKE_ASYNC(src, PROC_REF(start_playing), usr)
 		if("newline")
 			var/newline = html_encode(input("Enter your line: ", parent.name) as text|null)
 			if(!newline || !in_range(parent, usr))