update for c-toxcore 0.2.0+ API

[oxij]

The subject. See commit messages for more info.

[aitjcize]

thanks, can you fix CI?

[oxij]

Travis error looks like a dead URL. But anyway, I would rather delegate fixing CI to somebody on an hier(7)-compatible distro who can run those CI scripts locally (I run NixOS-like distro and most tests don't work under Nix anyway).