Report Media Issues (#1964)

* Started working on a report problems implementation.

* Started code

* Added logging to book and archive service.

* Removed an additional ComicInfo read when comicinfo is null when trying to load. But we've already done it once earlier, so there really isn't any point.

* Added basic implementation for media errors.

* MediaErrors will ignore duplicate errors when there are multiple issues on same file in a scan.

* Fixed unit tests

* Basic code in place to view and clear. Just UI Cleanup needed.

* Slight css upgrade

* Fixed up centering and simplified the code to use regular array instead of observables as it wasn't working.

* Fixed unit tests

* Fixed unit tests for real

API/Services/TaskScheduler.cs

@@ -399,6 +399,7 @@ public class TaskScheduler : ITaskScheduler
 
         var scheduledJobs = JobStorage.Current.GetMonitoringApi().ScheduledJobs(0, int.MaxValue);
         ret = scheduledJobs.Any(j =>
+            j.Value.Job != null &&
             j.Value.Job.Method.DeclaringType != null && j.Value.Job.Args.SequenceEqual(args) &&
             j.Value.Job.Method.Name.Equals(methodName) &&
             j.Value.Job.Method.DeclaringType.Name.Equals(className));