Remove PCL and some other unused code.

.gitlab-ci.yml

CMakeLists.txt

README.md

applications/registration/CMakeLists.txt

applications/registration/src/aruco.cpp

applications/registration/src/aruco.hpp

applications/registration/src/common.cpp

applications/registration/src/common.hpp

applications/registration/src/correspondances.cpp

applications/registration/src/correspondances.hpp

applications/registration/src/main.cpp

applications/registration/src/manual.cpp

applications/registration/src/manual.hpp

applications/registration/src/sfm.cpp

applications/registration/src/sfm.hpp

components/common/cpp/CMakeLists.txt

components/common/cpp/include/ftl/config.h.in

components/common/cpp/include/ftl/utility/opencv_to_pcl.hpp

components/common/cpp/src/opencv_to_pcl.cpp

components/operators/CMakeLists.txt