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/controllers/subsystem/explosions.dm

@@ -135,13 +135,13 @@ SUBSYSTEM_DEF(explosions)
 
 		if(dist < dev)
 			T.color = "red"
-			T.maptext = "Dev"
+			T.maptext = MAPTEXT("Dev")
 		else if (dist < heavy)
 			T.color = "yellow"
-			T.maptext = "Heavy"
+			T.maptext = MAPTEXT("Heavy")
 		else if (dist < light)
 			T.color = "blue"
-			T.maptext = "Light"
+			T.maptext = MAPTEXT("Light")
 		else
 			continue