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/__DEFINES/misc.dm

@@ -453,3 +453,8 @@ GLOBAL_LIST_INIT(ghost_others_options, list(GHOST_OTHERS_SIMPLE, GHOST_OTHERS_DE
 #define MOUSE_OPACITY_TRANSPARENT 0
 #define MOUSE_OPACITY_ICON 1
 #define MOUSE_OPACITY_OPAQUE 2
+
+//world/proc/shelleo
+#define SHELLEO_ERRORLEVEL 1
+#define SHELLEO_STDOUT 2
+#define SHELLEO_STDERR 3