Nicer logging

This MR adds:

• Colored log messages
• A success loglevel
• A warning when using default_chip.yaml
• Units to all progress bars

Also it fixes:

• All scans now call close() in the end
• Logging output from periphery is now added to logfile
• Don't show a warning if periphery is not set up at all
• scan_sensor_iv will only run if SensorBias device is defined
• General cleanup