Base Url Support (#642)

* Added base url config

* UI side is not working

* Working base url more

* Attempt to get UI to work with base url

* Implemented the ability to set the Base URL for the app

* Hooked in Base URL as a managed setting

* Ensure we always start with / for base url

* Removed default base href from debug builds. Cleaned up an issue with base url migration.

* Fixed an issue with our BaseURL migration

UI/Web/src/index.html

@@ -40,4 +40,9 @@
   <app-root></app-root>
   <noscript>Please enable JavaScript to continue using this application.</noscript>
 </body>
+<script>
+  (function() {
+    window['_app_base'] = '/' + window.location.pathname.split('/')[1];
+  })();
+</script>
 </html>