Turris OS 5.1.0 release

* Introduced new data collection system Sentinel
* reForis (future default web interface)
  * Now installed by default
  * Added NetMetr, OpenVPN client, and remote devices plugins
* Package lists
  * Expanded with labels and additional options
  * Added option to select alternative WiFi drivers
* Nextcloud updated to version 18
* Removed old Device Detection based on Suricata