Factor out LoggedInView from MatrixChat

The idea here is to make a layer which sits around for as long as we have a
valid MatrixClient. Also it makes a plausible split for the render of
MatrixChat, even if they are much too tightly bound for now.

src/PageTypes.js

@@ -0,0 +1,24 @@
+/*
+Copyright 2015, 2016 OpenMarket Ltd
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+/** The types of page which can be shown by the LoggedInView */
+export default {
+    RoomView: "room_view",
+    UserSettings: "user_settings",
+    CreateRoom: "create_room",
+    RoomDirectory: "room_directory",
+    UserView: "user_view",
+};