Persist Internals also in File

[henryk86]

Internals like

• internal.toniebox_firmware.boxIC
• internal.toniebox_firmware.uaVersionFirmware
• nternal.toniebox_firmware.uaVersionServicePack
• internal.toniebox_firmware.uaVersionHardware
• internal.last_connection
• internal.last_ruid

should be persisted in a file (per toniebox?) so the data is available after a restart of teddycloud even if the toniebox was not connected to the box again

this information would be a nice to have on the upcoming toniebox management page