Add Handy / Funscript support (#1377)

* Add funscript route to scenes

Adds a /scene/:id/funscript route which serves a funscript file, if present.

Current convention is that these are files stored with the same path, but with the extension ".funscript".

* Look for funscript during scan

This is stored in the Scene record and used to drive UI changes for funscript support.

Currently, that's limited to a funscript link in the Scene's file info.

* Add filtering and sorting for interactive
* Add Handy connection key to interface config
* Add Handy client and placeholder component.

Uses defucilis/thehandy, but not thehandy-react as I had difficulty integrating the context with the existing components.

Instead, the expensive calculation for the server time offset is put in localStorage for reuse.

A debounce was added when scrubbing the video, as otherwise it spammed the Handy API with updates to the current offset.

pkg/api/resolver_mutation_configure.go

@@ -246,6 +246,10 @@ func (r *mutationResolver) ConfigureInterface(ctx context.Context, input models.
 		c.Set(config.CSSEnabled, *input.CSSEnabled)
 	}
 
+	if input.HandyKey != nil {
+		c.Set(config.HandyKey, *input.HandyKey)
+	}
+
 	if err := c.Write(); err != nil {
 		return makeConfigInterfaceResult(), err
 	}