Add dslam camera calibration file
Load stereo camera calibration parameters from yaml string feeded by an ecto cell
Remove camera intrinsics from optimization
Calculate scale factor for odometry directly after the optimization
Remove hardcoded camera intrinsic and use the feed from dslam_source
bugfix in camera intrinsic readings and comments clean up
bugfix in gather_data.cpp
Add new ecto cell CalibrationTest in test_calibration.cpp