Modal Dialogs / Support for 9.70

OTC now supports showing and answering modal dialogs.

addDialog(modaldialog, dialogId, cid, callback)

TODO:
-find out what the "popup" value does.. (Maybe someone knows)

modules/game_interface/interface.otmod

@@ -30,5 +30,6 @@ Module
     - game_market
     - game_spelllist
     - game_cooldown
+    - game_modaldialog
   @onLoad: init()
   @onUnload: terminate()