Implement picture quality information

#28 

Please test this before merging.
First BACKUP THE IMAGES AND THE CALIBRATION RESULT!!!! Both will be deleted by the following steps!
1. Execute the position_module
2. Call start_calibration
3. Call take_calibration_picture
4. Check if the response matches the console output

(If you trust me you can also just merge this directly, or we do it monday)