Bookmarking Pages within the Reader (#469)

# Added
- Added: Added the ability to bookmark certain pages within the manga (image) reader and later download them from the series context menu. 

# Fixed
- Fixed: Fixed an issue where after adding a new folder to an existing library, a scan wouldn't be kicked off
- Fixed: In some cases, after clicking the background of a modal, the modal would close, but state wouldn't be handled as if cancel was pushed

# Changed
- Changed: Admin contextual actions on cards will now be separated by a line to help differentiate. 
- Changed: Performance enhancement on an API used before reading

# Dev
- Bumped dependencies to latest versions

=============================================
* Bumped versions of dependencies and refactored bookmark to progress.

* Refactored method names in UI from bookmark to progress to prepare for new bookmark entity

* Basic code is done, user can now bookmark a page (currently image reader only).

* Comments and pipes

* Some accessibility for new bookmark button

* Fixed up the APIs to work correctly, added a new modal to quickly explore bookmarks (not implemented, not final).

* Cleanup on the UI side to get the modal to look decent

* Added dismissed handlers for modals where appropriate

* Refactored UI to only show number of bookmarks across files to simplify delivery. Admin actionables are now separated by hr vs non-admin actions.

* Basic API implemented, now to implement the ability to actually extract files.

* Implemented the ability to download bookmarks.

* Fixed a bug where adding a new folder to an existing library would not trigger a scan library task.

* Fixed an issue that could cause bookmarked pages to get copied out of order.

* Added handler from series-card component

UI/Web/src/app/shared/_services/download.service.ts

@@ -7,6 +7,8 @@ import { saveAs } from 'file-saver';
 import { Chapter } from 'src/app/_models/chapter';
 import { Volume } from 'src/app/_models/volume';
 import { ToastrService } from 'ngx-toastr';
+import { PageBookmark } from 'src/app/_models/page-bookmark';
+import { map, take } from 'rxjs/operators';
 
 @Injectable({
   providedIn: 'root'
@@ -85,6 +87,12 @@ export class DownloadService {
     });
   }
 
+  downloadBookmarks(bookmarks: PageBookmark[], seriesName: string) {
+    return this.httpClient.post(this.baseUrl + 'download/bookmarks', {bookmarks}, {observe: 'response', responseType: 'blob' as 'text'}).pipe(take(1), map(resp => {
+      this.preformSave(resp.body || '', this.getFilenameFromHeader(resp.headers, seriesName));
+    }));
+  }
+
   private preformSave(res: string, filename: string) {
     const blob = new Blob([res], {type: 'text/plain;charset=utf-8'});
     saveAs(blob, filename);