Remove old user and room settings

This takes out the old user and room settings, replacing the paths with the new dialog editions. The labs setting has been removed in order to support this change.

In addition to removing the old components outright, some older components which were only used by the settings pages have been removed. The exception is the ColorSettings component as it has a high chance of sticking around in the future.

Styles that were shared by the settings components have been broken out to dedicated sections, making it easier to remove the old styles entirely.

Some stability testing of the app has been performed to ensure the app still works, however given the scope of this change there is a possibility of some broken functionality.

src/UserSettingsStore.js

@@ -1,6 +1,6 @@
 /*
 Copyright 2015, 2016 OpenMarket Ltd
-Copyright 2017 New Vector Ltd
+Copyright 2017, 2019 New Vector Ltd
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
@@ -15,47 +15,10 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import Promise from 'bluebird';
 import MatrixClientPeg from './MatrixClientPeg';
 
-/*
- * TODO: Make things use this. This is all WIP - see UserSettings.js for usage.
- */
+// TODO: Decommission.
 export default {
-    loadProfileInfo: function() {
-        const cli = MatrixClientPeg.get();
-        return cli.getProfileInfo(cli.credentials.userId);
-    },
-
-    saveDisplayName: function(newDisplayname) {
-        return MatrixClientPeg.get().setDisplayName(newDisplayname);
-    },
-
-    loadThreePids: function() {
-        if (MatrixClientPeg.get().isGuest()) {
-            return Promise.resolve({
-                threepids: [],
-            }); // guests can't poke 3pid endpoint
-        }
-        return MatrixClientPeg.get().getThreePids();
-    },
-
-    saveThreePids: function(threePids) {
-        // TODO
-    },
-
-    changePassword: function(oldPassword, newPassword) {
-        const cli = MatrixClientPeg.get();
-
-        const authDict = {
-            type: 'm.login.password',
-            user: cli.credentials.userId,
-            password: oldPassword,
-        };
-
-        return cli.setPassword(authDict, newPassword);
-    },
-
     /*
      * Returns the email pusher (pusher of type 'email') for a given
      * email address. Email pushers all have the same app ID, so since
@@ -74,10 +37,6 @@ export default {
         return undefined;
     },
 
-    hasEmailPusher: function(pushers, address) {
-        return this.getEmailPusher(pushers, address) !== undefined;
-    },
-
     addEmailPusher: function(address, data) {
         return MatrixClientPeg.get().setPusher({
             kind: 'email',