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

config/config.txt

@@ -191,6 +191,14 @@ CHECK_RANDOMIZER
 ## Ban appeals URL - usually for a forum or wherever people should go to contact your admins.
 # BANAPPEALS http://justanotherday.example.com
 
+## System command that invokes youtube-dl, used by Play Internet Sound.
+## You can install youtube-dl with
+## "pip install youtube-dl" if you have pip installed
+## from https://github.com/rg3/youtube-dl/releases
+## or your package manager
+## The default value assumes youtube-dl is in your system PATH
+# INVOKE_YOUTUBEDL youtube-dl
+
 ## In-game features
 ##Toggle for having jobs load up from the .txt
 # LOAD_JOBS_FROM_TXT