Moving more of the logic into ShareMode, but still have much more testing to do

onionshare_gui/receive_mode.py

@@ -28,3 +28,9 @@ class ReceiveMode(QtWidgets.QWidget):
     def __init__(self, common):
         super(ReceiveMode, self).__init__()
         self.common = common
+
+    def timer_callback(self):
+        """
+        This method is called regularly on a timer while receive mode is active.
+        """
+        pass