Resolves #199 use of channel id in streams

applications/calibration-multi/src/main.cpp

applications/groupview/src/main.cpp

applications/gui/src/camera.cpp

applications/gui/src/camera.hpp

applications/gui/src/media_panel.cpp

applications/player/src/main.cpp

applications/reconstruct/src/ilw.cpp

applications/reconstruct/src/ilw/ilw.cpp

applications/reconstruct/src/main.cpp

components/codecs/include/ftl/codecs/channels.hpp

components/codecs/include/ftl/codecs/packet.hpp

components/codecs/test/CMakeLists.txt

components/codecs/test/channel_unit.cpp

components/codecs/test/readwrite_test.cpp

components/renderers/cpp/include/ftl/render/splat_render.hpp

components/renderers/cpp/src/splat_render.cpp

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

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

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

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