Goonchat Admin Filters

This adds Message filters to Goonchat (only for mentors +
administrators).

There is a new option in the settings dropdown of Goonchat to access
these. They are temporary, non-destructive filters which will hide all
messages matching them that are already in your chat, as well as any new
messages matching them.

There are 5 filters currently:
 - Admin; Filters out most admin logs.
 - Combat; Filters out a limited subset of combat messages-
 Specifically, any message with the 'combat' span class. Currently, this
 has only been added to the central /attack and /attacked_by procs, so a
 large considerable amount of hostile actions taken against a
 player are still not going to be filtered out. We can work on adding
 the identifier to more stuff later.
 - Radios: Filters out all radio messages.
 - Speech: Filters out all mob speech.
 - OOC: Filters out OOC chat.

There is also an "All" option, which just turns off all messages that
are not internal to Goonchat.

code/modules/admin/admin_verbs.dm

@@ -166,7 +166,7 @@ var/list/admin_verbs_debug = list(
 	/client/proc/admin_serialize,
 	/client/proc/admin_deserialize,
 	/client/proc/jump_to_ruin,
-	/client/proc/toggle_medal_disable	
+	/client/proc/toggle_medal_disable
 	)
 var/list/admin_verbs_possess = list(
 	/proc/possess,
@@ -213,6 +213,10 @@ var/list/admin_verbs_snpc = list(
 	/client/proc/hide_snpc_verbs
 )
 
+/client/proc/on_holder_add()
+	if(chatOutput && chatOutput.loaded)
+		chatOutput.loadAdmin()
+
 /client/proc/add_admin_verbs()
 	if(holder)
 		verbs += admin_verbs_default

code/modules/admin/holder2.dm

@@ -32,6 +32,7 @@ var/list/admin_datums = list()
 	if(istype(C))
 		owner = C
 		owner.holder = src
+		owner.on_holder_add()
 		owner.add_admin_verbs()	//TODO
 		owner.verbs -= /client/proc/readmin
 		admins |= C