Various bug fixes (#2935)

* Sort scene/image/gallery tags by name
* Calculate md5 if missing
* Prevent multiple folder create logs

pkg/sqlite/image.go

@@ -1076,7 +1076,9 @@ func (qb *ImageStore) tagsRepository() *joinRepository {
 			tableName: imagesTagsTable,
 			idColumn:  imageIDColumn,
 		},
-		fkColumn: tagIDColumn,
+		fkColumn:     tagIDColumn,
+		foreignTable: tagTable,
+		orderBy:      "tags.name ASC",
 	}
 }