Setup and migration UI refactor (#1190)

* Make config instance-based
* Remove config dependency in paths
* Refactor config init
* Allow startup without database
* Get system status at UI initialise
* Add setup wizard
* Cache and Metadata optional. Database mandatory
* Handle metadata not set during full import/export
* Add links
* Remove config check middleware
* Stash not mandatory
* Panic on missing mandatory config fields
* Redirect setup to main page if setup not required
* Add migration UI
* Remove unused stuff
* Move UI initialisation into App
* Don't create metadata paths on RefreshConfig
* Add folder selector for generated in setup
* Env variable to set and create config file.
Make docker images use a fixed config file.
* Set config file during setup

pkg/api/resolver_query_scene.go

@@ -30,5 +30,5 @@ func (r *queryResolver) SceneStreams(ctx context.Context, id *string) ([]*models
 	baseURL, _ := ctx.Value(BaseURLCtxKey).(string)
 	builder := urlbuilders.NewSceneURLBuilder(baseURL, scene.ID)
 
-	return manager.GetSceneStreamPaths(scene, builder.GetStreamURL(), config.GetMaxStreamingTranscodeSize())
+	return manager.GetSceneStreamPaths(scene, builder.GetStreamURL(), config.GetInstance().GetMaxStreamingTranscodeSize())
 }