Ports Goonchat from Baystation. (#9635)

changes:

    rscadd: "Ported a new chat system, Goonchat, that allows for cool things like changing font style, size, spacing, highlighting up to 5 strings in the chat, and DARK MODE."
    rscadd: "Repeated chat messages can now get compacted. You can disable this in goonchat settings."
    rscadd: "You can change icon style to any font on your system."
    tweak: "The game window has been altered a bit to adjust for this."
    rscdel: "Removed skin style prefs as they are no longer used."

code/modules/maps/swapmaps.dm

@@ -490,8 +490,8 @@ atom
 
 // set this up (at runtime) as follows:
 // list(\
-//     'player.dmi'="player",\
-//     'monster.dmi'="monster",\
+//     'player.dmi'="player",
+//     'monster.dmi'="monster",
 //     ...
 //     'item.dmi'="item")
 var/list/swapmaps_iconcache