v0.16 tracking issue

[MagnusS]

Move v0.16.0 to master and tag a new release.

Checklist:

• [ ] Update README with new nix build instructions
  • open PRs https://github.com/includeos/IncludeOS/pull/2287
• [ ] Add CHANGELOG with recent PRs
• [ ] Update README in hello_world (open PR https://github.com/includeos/hello_world/pull/12)
• [ ] Archive unused repos
  • [ ] https://github.com/includeos/includeos-tools (no longer needed?)
  • [ ] https://github.com/includeos/homebrew-includeos (no longer needed)
  • [ ] https://github.com/includeos/conan_config (replaced)
  • [ ] https://github.com/includeos/conan (replaced)
  • [ ] https://github.com/includeos/musl (now downloaded by nix)
  • [ ] https://github.com/includeos/vmbuild (moved to includeos repo)
  • [ ] others?
• [ ] Deprecate (or update README?) in https://github.com/includeos/demo-examples/
• [ ] Make v0.16.0-release branch new master
• [ ] Tag and write release notes