Disable all shell() exec prox for extra security.

We do not use python or nodejs scripts. Our discord bot makes HTTP
requests.  Therefore we can entirely disable this code.  Even if we ever
want to start using these procs for discord integration, we would pipe it
through our HTTP discord proxy, not use shell().
With all instances of shell() disabled, we can't be attacked by it.

code/modules/ext_scripts/irc.dm

@@ -1,4 +1,5 @@
 /proc/send2irc(var/channel, var/msg)
+	return  // VOREStation Edit - Can't exploit shell if we never call shell!
 	if (config.use_irc_bot)
 		if (config.use_node_bot)
 			shell("node bridge.js -h \"[config.irc_bot_host]\" -p \"[config.irc_bot_port]\" -c \"[channel]\" -m \"[msg]\"")

code/modules/ext_scripts/python.dm

@@ -1,4 +1,5 @@
 /proc/ext_python(var/script, var/args, var/scriptsprefix = 1)
+	return  // VOREStation Edit - Can't exploit shell if we never call shell!
 	if(scriptsprefix) script = "scripts/" + script
 
 	if(world.system_type == MS_WINDOWS)