Wrap game resource info from the server

Also add function to get the diff archive (for faster updating)

Download function soon, although I can't make sure that the download function will work properly (like pause, resume download etc.)

worthless/__main__.py

@@ -1,6 +1,6 @@
 #!/usr/bin/python3
 
-import gui as gui
+from worthless import gui
 
 if __name__ == '__main__':
     gui.main()