mode0x13

We're already using mbedTLS for the auto-updater, so we could consider supporting TLS Stratum protocol.

The auto-update process can fail when the program doesn't have write permissions to its directory. In some cases, e.g. when `.cnrig-cacert.pem` can't be written, the program exits. Instead it should...

`/etc/resolv.conf` might contain badly configured DNS servers. CNRig should have a built-in DNS resolver as an emergency fallback.

Support remote config files, e.g. hosted on GitHub. * ```--remote-config https://raw.githubusercontent.com/user/repo/config.json``` * Poll URL regularly * Restart miner on update Necessary?