Better spam prevention placing (#680)

Removes the spam prevention procs from all background procs, and ensures that they're only placed on procs that the user can initiate.

This will remove the chance of having spam prevention trigger from automated emotes.

Fixes #613

code/modules/mob/say.dm

@@ -26,6 +26,10 @@
 	*/
 
 	set_typing_indicator(0)
+
+	if (src.client.handle_spam_prevention(message, MUTE_IC))
+		return
+
 	usr.say(message)
 
 /mob/verb/me_verb(message as text)
@@ -39,6 +43,10 @@
 	message = sanitize(message)
 
 	set_typing_indicator(0)
+
+	if (src.client.handle_spam_prevention(message, MUTE_IC))
+		return
+
 	if(use_me)
 		usr.emote("me",usr.emote_type,message)
 	else