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

graphql/documents/data/image.graphql

@@ -0,0 +1,35 @@
+fragment ImageData on Image {
+  id
+  checksum
+  title
+  rating
+  o_counter
+  path
+
+  file {
+    size
+    width
+    height
+  }
+
+  paths {
+    thumbnail
+    image
+  }
+
+  galleries {
+    ...GalleryData
+  }
+
+  studio {
+    ...StudioData
+  }
+  
+  tags {
+    ...TagData
+  }
+
+  performers {
+    ...PerformerData
+  }
+}