WIP switch to double precision

applications/gui/src/src_window.cpp

applications/reconstruct/src/virtual_source.cpp

applications/registration/src/correspondances.cpp

applications/registration/src/correspondances.hpp

components/renderers/cpp/include/ftl/rgbd_display.hpp

components/renderers/cpp/src/rgbd_display.cpp

components/rgbd-sources/include/ftl/rgbd/detail/source.hpp

components/rgbd-sources/include/ftl/rgbd/snapshot.hpp

components/rgbd-sources/include/ftl/rgbd/source.hpp

components/rgbd-sources/src/local.cpp

components/rgbd-sources/src/net.cpp

components/rgbd-sources/src/net.hpp

components/rgbd-sources/src/snapshot.cpp

components/rgbd-sources/src/snapshot_source.cpp

components/rgbd-sources/src/source.cpp

components/rgbd-sources/src/streamer.cpp