Continue the ModeRoute work. Routes are reachable, but extensionManager needs to be improve to provide module entries correctly

platform/viewer/public/config/default.js

@@ -1,7 +1,7 @@
 window.config = {
   routerBasename: '/',
   // whiteLabelling: {},
-  extensions: [],
+  extensions: ['org.ohif.default'],
   modes: [],
   showStudyList: true,
   // filterQueryParam: false,