Library Recomendations (#1236)

* Updated cover regex for finding cover images in archives to ignore back_cover or back-cover

* Fixed an issue where Tags wouldn't save due to not pulling them from the DB.

* Refactored All series to it's own lazy loaded module

* Modularized Dashboard and library detail. Had to change main dashboard page to be libraries. Subject to change.

* Refactored login component into registration module

* Series Detail module created

* Refactored nav stuff into it's own module, not lazy loaded, but self contained.

* Refactored theme component into a dev only module so we don't incur load for temp testing modules

* Finished off modularization code. Only missing thing is to re-introduce some dashboard functionality for library view.

* Implemented a basic recommendation page for library detail

UI/Web/src/app/_services/scroll.service.ts

@@ -0,0 +1,22 @@
+import { ElementRef, Injectable } from '@angular/core';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class ScrollService {
+
+  constructor() { }
+
+  get scrollPosition() {
+    return (window.pageYOffset 
+      || document.documentElement.scrollTop 
+      || document.body.scrollTop || 0);
+  }
+
+  scrollTo(top: number, el: Element | Window = window) {
+    el.scroll({
+      top: top,
+      behavior: 'smooth' 
+    });
+  }  
+}