Remove __gluestate__ and __setgluestate__ from base Application class…

… since it is different between Jupyter and Qt glue

glue/core/application_base.py

@@ -350,18 +350,3 @@ def set_data_color(self, color, alpha):
         for data in self.data_collection:
             data.style.color = color
             data.style.alpha = alpha
-
-    def __gluestate__(self, context):
-        viewers = [list(map(context.id, tab)) for tab in self.viewers]
-        data = self.session.data_collection
-        from glue.main import _loaded_plugins
-        return dict(session=context.id(self.session), viewers=viewers,
-                    data=context.id(data), plugins=_loaded_plugins)
-
-    @classmethod
-    def __setgluestate__(cls, rec, context):
-        self = cls(data_collection=context.object(rec['data']))
-        # manually register the newly-created session, which
-        # the viewers need
-        context.register_object(rec['session'], self.session)
-        return self