v1.3.0-essential

Essential release based on v1.3.0

• Removed configuration for serial port, see issue #86
• provide result of iss sensors as csv
• increase MAX_LINE_LENGTH to 1000
• Switch display on and of with A button in iss-sensors.hex
• use compass in iss-sensors.hex without calibration
• optional calibration of compass by pressing A+B in iss-sensors.hex