offloaded Significator FTs into FTs.test_room_sig_select; new sig-select.js imported into room.html; new apps.epic.consumers & .views, ITs to confirm functionality

src/apps/epic/tests/integrated/test_views.py

@@ -902,7 +902,7 @@ class SelectSigCardViewTest(TestCase):
     def test_select_sig_notifies_ws(self):
         with patch("apps.epic.views._notify_sig_selected") as mock_notify:
             self._post()
-            mock_notify.assert_called_once_with(self.room.id)
+            mock_notify.assert_called_once()
 
     def test_select_sig_requires_login(self):
         self.client.logout()