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/app/admin/_models/server-settings.ts

@@ -7,4 +7,5 @@ export interface ServerSettings {
     allowStatCollection: boolean;
     enableOpds: boolean;
     enableAuthentication: boolean;
+    baseUrl: string;
 }