JavaCV arm64 support

[joshuajaharwood]

Project doesn't build on macOS arm64 machines currently. Might require a JavaCV bump?

[lessthanoptimal]

yep this would be good to add. Plus need to revisit how these OS specific binaries are included. Another issue is updating FFMPEG wrapper which comes from JavaCV. I can't remember why any more, but only exactly the code which was needed was ripped out and copied over.

[joshuajaharwood]

I'll take a look at the copied over code and see if I can work out why it was copied. If we want to bump the JavaCV binaries to a version that has arm64 variants, it looks like we'll have to use a newer version of ffmpeg which will undoubtedly have API-breaking changes.

I've experimentally bumped JavaCV ffmpeg to latest and it'll pull in the following libs which should satisfy basically all modern CPU microarchitectures if you're happy with that approach?

[joshuajaharwood]

#443