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_query_configuration.go

@@ -95,6 +95,7 @@ func makeConfigInterfaceResult() *models.ConfigInterfaceResult {
 	cssEnabled := config.GetCSSEnabled()
 	language := config.GetLanguage()
 	slideshowDelay := config.GetSlideshowDelay()
+	handyKey := config.GetHandyKey()
 
 	return &models.ConfigInterfaceResult{
 		MenuItems:           menuItems,
@@ -108,6 +109,7 @@ func makeConfigInterfaceResult() *models.ConfigInterfaceResult {
 		CSSEnabled:          &cssEnabled,
 		Language:            &language,
 		SlideshowDelay:      &slideshowDelay,
+		HandyKey:            &handyKey,
 	}
 }