* adds a tab on startup that shows last connected secnodes
* last nodes saved with qsettings
Change-Id: I2b663a408dc46bd0a0135e723b55d5ef3661bec8
Reviewed-on: https://forge.frm2.tum.de/review/c/secop/frappy/+/30524
Tested-by: Jenkins Automated Tests <pedersen+jenkins@frm2.tum.de>
Reviewed-by: Alexander Zaft <a.zaft@fz-juelich.de>