Get & display pushers in settings

Really this is so (in a subsequent PR) we can show whether a user has an email pusher, but we can basically display the list of pushers for free, so adding this too.

src/skins/vector/css/vector-web/views/settings/Notifications.css

@@ -60,3 +60,8 @@ limitations under the License.
     cursor: pointer;
     color: #76cfa6;
 }
+
+.mx_UserSettings_devicesTable td {
+    padding-left: 20px;
+    padding-right: 20px;
+}