[Files Refactor] Performance tuning (#2865)

* Don't load image files by default
* Don't load gallery files by default
* Don't load scene files by default
* Retry locked transactions forever
* Don't show release notes if config not loaded
* Don't translate path slashes in export

pkg/scene/export.go

@@ -56,7 +56,7 @@ func ToBasicJSON(ctx context.Context, reader CoverGetter, scene *models.Scene) (
 	newSceneJSON.Organized = scene.Organized
 	newSceneJSON.OCounter = scene.OCounter
 
-	for _, f := range scene.Files {
+	for _, f := range scene.Files.List() {
 		newSceneJSON.Files = append(newSceneJSON.Files, f.Base().Path)
 	}