rework emby collection scanning (#1205)

* optimize emby collection scan frequency

* add button to sync emby collections

* update changelog

* fix scanning; add progress indicator

ErsatzTV.Core/Interfaces/Locking/IEntityLocker.cs

@@ -6,6 +6,7 @@ public interface IEntityLocker
     event EventHandler OnPlexChanged;
     event EventHandler<Type> OnRemoteMediaSourceChanged;
     event EventHandler OnTraktChanged;
+    event EventHandler OnEmbyCollectionsChanged;
     bool LockLibrary(int libraryId);
     bool UnlockLibrary(int libraryId);
     bool IsLibraryLocked(int libraryId);
@@ -18,4 +19,7 @@ public interface IEntityLocker
     bool IsTraktLocked();
     bool LockTrakt();
     bool UnlockTrakt();
+    bool LockEmbyCollections();
+    bool UnlockEmbyCollections();
+    bool AreEmbyCollectionsLocked();
 }

ErsatzTV.Core/Interfaces/Repositories/IMediaSourceRepository.cs

@@ -83,4 +83,5 @@ public interface IMediaSourceRepository
     Task<List<int>> DeleteAllEmby();
     Task<Unit> EnableEmbyLibrarySync(IEnumerable<int> libraryIds);
     Task<List<int>> DisableEmbyLibrarySync(List<int> libraryIds);
+    Task<Unit> UpdateLastScan(EmbyMediaSource embyMediaSource);
 }