Simplify Folder Watcher (#1484)

* Refactored Library Watcher to use Hangfire under the hood.

* Support .kavitaignore at root level.

* Refactored a lot of the library watching code to process faster and handle when FileSystemWatcher runs out of internal buffer space. It's still not perfect, but good enough for basic use.

* Make folder watching as experimental and default it to off by default.

* Revert #1479

* Tweaked the messaging for OPDS to remove a note about download role.

Moved some code closer to where it's used.

* Cleaned up how the events widget reports

* Fixed a null issue when deleting series in the UI

* Cleaned up some debug code

* Added more information for when we skip a scan

* Cleaned up some logging messages in CoverGen tasks

* More log message tweaks

* Added some debug to help identify a rare issue

* Fixed a bug where save bookmarks as webp could get reset to false when saving other server settings

* Updated some documentation on library watcher.

* Make LibraryWatcher fire every 5 mins

UI/Web/src/app/nav/events-widget/events-widget.component.ts

@@ -68,7 +68,6 @@ export class EventsWidgetComponent implements OnInit, OnDestroy {
   ngOnInit(): void {
     this.messageHub.messages$.pipe(takeUntil(this.onDestroy)).subscribe(event => {
       if (event.event === EVENTS.NotificationProgress) {
-        console.log('[Event Widget]: Event came in ', event.payload);
         this.processNotificationProgressEvent(event);
       } else if (event.event === EVENTS.Error) {
         const values = this.errorSource.getValue();