* Generate screenshot images for markers
In some scenarios it might not be possible to use the preview video or
image of markers, i.e. when only static images are supported like in
Kodi. So generate a static screenshot as well.
* Make generating animated and static image optional for markers
* Use screenshot for markers when preview type is set to static image
* 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.
