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/gamelib/game.lua

@@ -50,7 +50,7 @@ function g_game.getSupportedProtocols()
   return {
     810, 853, 854, 860, 861, 862, 870,
     910, 940, 944, 953, 954, 960, 961,
-    963
+    963, 970
   }
 end