Download Refactor (#483)

# Added
- New: Cards when processing a download shows a spinner for the progress of the download

# Changed
- Changed: Downloads now always take the backend filename and are streamed in a more optimal manner, reducing the javascript processing that was needed previously.
==================================

* Started refactor of downloader to be more UX friendly and much faster.

* Completed refactor of Volume download to use a new mechanism. Downloads are streamed over and filename used exclusively from header. Backend has additional DB calls to get the Series Name information to make filenames nice.

* download service has been updated so all download functions use new event based observable. Duplicates code for downloading, but much cleaner and faster.

* Small code cleanup

UI/Web/src/app/shared/card-item/card-item.component.html

@@ -1,15 +1,24 @@
 <div class="card">
-    <div class="overlay" (click)="handleClick()">
+    <div class="overlay"  (click)="handleClick()">
       <img *ngIf="total > 0 || supressArchiveWarning" class="card-img-top lazyload" [src]="imageSerivce.placeholderImage" [attr.data-src]="imageUrl" 
             (error)="imageSerivce.updateErroredImage($event)" aria-hidden="true" height="230px" width="158px">
       <img *ngIf="total === 0 && !supressArchiveWarning" class="card-img-top lazyload" [src]="imageSerivce.errorImage" [attr.data-src]="imageUrl" 
             aria-hidden="true" height="230px" width="158px">
       <div class="progress-banner" *ngIf="read < total && total > 0 && read !== (total -1)">
         <p><ngb-progressbar type="primary" height="5px" [value]="read" [max]="total"></ngb-progressbar></p>
+
+        <span class="download" *ngIf="download$ | async as download">
+          <app-circular-loader [currentValue]="download.progress"></app-circular-loader>
+          <span class="sr-only" role="status">
+            {{download.progress}}% downloaded
+          </span>
+        </span>
       </div>
       <div class="error-banner" *ngIf="total === 0 && !supressArchiveWarning">
         Cannot Read Archive
       </div>
+
+      
       
       <div class="not-read-badge" *ngIf="read === 0 && total > 0"></div>
     </div>