Adds Internet admin midi (#30457)

* Adds Internet admin midi

* Moves global regex into proc (shell_url_scrub)

* Moves shelleo to world
Adds quotes around the command in shelleo, to encapsulate it

* Admins can stop playing web sounds

* Revised internet midi extension order
Moved m4a to least preferred,
as it can potentially carry non-aac or non-mpeg-3 audio

* Kills \n in web sound

* play_web_sound availability based on config

* play web sound and shelleo tweaks

istypeless for in play web sound & readability parenthesis around binary AND
add return index defines for shelleo proc

* Security fix for play web sound

code/controllers/configuration.dm

@@ -16,7 +16,7 @@ GLOBAL_PROTECT(config_dir)
 	return ..()
 
 /datum/configuration/vv_edit_var(var_name, var_value)
-	var/static/list/banned_edits = list("cross_address", "cross_allowed", "autoadmin", "autoadmin_rank")
+	var/static/list/banned_edits = list("cross_address", "cross_allowed", "autoadmin", "autoadmin_rank", "invoke_youtubedl")
 	if(var_name in banned_edits)
 		return FALSE
 	return ..()
@@ -94,6 +94,8 @@ GLOBAL_PROTECT(config_dir)
 	var/panic_server_name
 	var/panic_address //Reconnect a player this linked server if this server isn't accepting new players
 
+	var/invoke_youtubedl
+
 	//IP Intel vars
 	var/ipintel_email
 	var/ipintel_rating_bad = 1
@@ -476,6 +478,8 @@ GLOBAL_PROTECT(config_dir)
 				if("panic_server_address")
 					if(value != "byond://address:port")
 						panic_address = value
+				if("invoke_youtubedl")
+					invoke_youtubedl = value
 				if("show_irc_name")
 					showircname = 1
 				if("see_own_notes")