* 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.
