Add filesystem based blob storage (#3187)

* Refactor transaction hooks. Add preCommit
* Add BlobStore
* Use blobStore for tag images
* Use blobStore for studio images
* Use blobStore for performer images
* Use blobStore for scene covers
* Don't generate screenshots in legacy directory
* Run post-hooks outside original transaction
* Use blobStore for movie images
* Remove unnecessary DestroyImage methods
* Add missing filter for scene cover
* Add covers to generate options
* Add generate cover option to UI
* Add screenshot migration
* Delete thumb files as part of screenshot migration

pkg/sqlite/transaction.go

@@ -131,13 +131,13 @@ func (db *Database) TxnRepository() models.Repository {
 		Gallery:        db.Gallery,
 		GalleryChapter: GalleryChapterReaderWriter,
 		Image:          db.Image,
-		Movie:          MovieReaderWriter,
+		Movie:          db.Movie,
 		Performer:      db.Performer,
 		Scene:          db.Scene,
 		SceneMarker:    SceneMarkerReaderWriter,
 		ScrapedItem:    ScrapedItemReaderWriter,
-		Studio:         StudioReaderWriter,
-		Tag:            TagReaderWriter,
+		Studio:         db.Studio,
+		Tag:            db.Tag,
 		SavedFilter:    SavedFilterReaderWriter,
 	}
 }