Everything that uses maptext now uses the class that makes it actually readable (#55420)

Adds a MAPTEXT macro that wraps the given text in the maptext class, the thing we use for Runechat to make it so you can actually read it. Everything that sets maptext now uses this.

code/modules/admin/sound_emitter.dm

@@ -81,7 +81,7 @@
 		var/new_label = stripped_input(user, "Choose a new label.", "Sound Emitter")
 		if(!new_label)
 			return
-		maptext = new_label
+		maptext = MAPTEXT(new_label)
 		to_chat(user, "<span class='notice'>Label set to [maptext].</span>", confidential = TRUE)
 	if(href_list["edit_sound_file"])
 		var/new_file = input(user, "Choose a sound file.", "Sound Emitter") as null|sound

code/modules/admin/verbs/mapping.dm

@@ -83,7 +83,7 @@ GLOBAL_PROTECT(admin_verbs_debug_mapping)
 			for(var/turf/T in C.can_see())
 				seen[T]++
 		for(var/turf/T in seen)
-			T.maptext = "[seen[T]]"
+			T.maptext = MAPTEXT(seen[T])
 	SSblackbox.record_feedback("tally", "admin_verb", 1, "Show Camera Range") //If you are copy-pasting this, ensure the 2nd parameter is unique to the new proc!
 	SSblackbox.record_feedback("tally", "admin_verb", 1, "Show Camera Range")