[Tox Support] signed packages

[nurupo]

qTox and uTox have their releases signed on their GitHub Releases pages:
qTox: https://github.com/qTox/qTox/releases
uTox: https://github.com/uTox/uTox/releases

The .asc files are the detached signatures.

Here is the list of people signing for qTox:
https://github.com/qTox/qTox#gpg-fingerprints
and here is the list for uTox: https://github.com/uTox/uTox#team

qTox and uTox are also packaged in Debian, Ubuntu and other Linux
distributions, which utilize their own package signing mechanism.