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_modaldialog/modaldialog.otmod

@@ -0,0 +1,10 @@
+Module
+  name: game_modaldialog
+  description: Show and process modal dialogs
+  author: Summ
+  website: www.otclient.info
+  sandboxed: true
+  dependencies: [ game_interface ]
+  scripts: [ modaldialog.lua ]
+  @onLoad: init()
+  @onUnload: terminate()