Revert "ugly hacks for stereo camera in calibration"

applications/gui2/src/modules/calibration/calibration.hpp

applications/gui2/src/modules/calibration/extrinsic.cpp

applications/gui2/src/modules/calibration/intrinsic.cpp

applications/gui2/src/modules/calibration/stereo.cpp

applications/gui2/src/views/calibration/extrinsicview.cpp

applications/gui2/src/views/calibration/intrinsicview.cpp

applications/gui2/src/views/calibration/stereoview.cpp

components/calibration/include/ftl/calibration/extrinsic.hpp

components/calibration/include/ftl/calibration/optimize.hpp

...onents/calibration/include/ftl/calibration/structures.hpp

components/calibration/src/extrinsic.cpp

components/calibration/src/optimize.cpp

components/calibration/src/structures.cpp