Containing Group/Sub-Group relationships (#5105)

* Add UI support for setting containing groups
* Show containing groups in group details panel
* Move tag hierarchical filter code into separate type
* Add depth to scene_count and add sub_group_count
* Add sub-groups tab to groups page
* Add containing groups to edit groups dialog
* Show containing group description in sub-group view
* Show group scene number in group scenes view
* Add ability to drag move grid cards
* Add sub group order option
* Add reorder sub-groups interface
* Separate page size selector component
* Add interfaces to add and remove sub-groups to a group
* Separate MultiSet components
* Allow setting description while setting containing groups

pkg/models/repository_group.go

@@ -66,6 +66,8 @@ type GroupReader interface {
 	GroupCounter
 	URLLoader
 	TagIDLoader
+	ContainingGroupLoader
+	SubGroupLoader
 
 	All(ctx context.Context) ([]*Group, error)
 	GetFrontImage(ctx context.Context, groupID int) ([]byte, error)