Images section (#813)

* Add new configuration options
* Refactor scan/clean
* Schema changes
* Add details to galleries
* Remove redundant code
* Refine thumbnail generation
* Gallery overhaul
* Don't allow modifying zip gallery images
* Show gallery card overlays
* Hide zoom slider when not in grid mode

pkg/manager/gallery.go

@@ -0,0 +1,17 @@
+package manager
+
+import (
+	"os"
+
+	"github.com/stashapp/stash/pkg/logger"
+	"github.com/stashapp/stash/pkg/models"
+)
+
+func DeleteGalleryFile(gallery *models.Gallery) {
+	if gallery.Path.Valid {
+		err := os.Remove(gallery.Path.String)
+		if err != nil {
+			logger.Warnf("Could not delete file %s: %s", gallery.Path.String, err.Error())
+		}
+	}
+}