[add] auto-find center
[add] Power controlled by Arduino && mo4r calibration images
[ref] L is now given from plate center to the stand, no more to the camera lens
[enh] Small UI fixes && enhancements
Merge branch 'master' of github.com:fhennecker/semiteleporter
[enh] auto find center
[add] safeguard if center not found
[ref] Gui scan buttons
[add] autofind center when calibrating from gui
[add] show cross after autofind cehter
[fix] render params save/load
[fix] Missing self.
Merge branch 'ref-gui' of github.com:fhennecker/semiteleporter into mergecalib

Conflicts:
	src/image_processing/gui.py
[add] autocenter in calibrate_from_scanner
[fix] auto center now working