Bugfix/performance release 0.6.7:
- better/faster rendering for the encoder/send web interface! (#171)
- can run on background thread with offscreen canvas. This is very helpful on some platforms, e.g. android PWAs and webviews.
- still on the main thread by default
- C api cleanup!
- encoder API less dependent on GL (#168)
- encoder API now allows multiples of input buffer size (#172, #174)
- misc bugfixes! (#168 and others)
- corrected cache purging logic for service workers (#171)
- fix zstd decompress bug (would lead to crash) (#175)
