Implements #134 source groups

applications/groupview/src/main.cpp

applications/gui/src/camera.cpp

applications/gui/src/camera.hpp

applications/gui/src/src_window.cpp

applications/reconstruct/include/ftl/voxel_scene.hpp

applications/reconstruct/src/main.cpp

applications/reconstruct/src/splat_render.cpp

applications/reconstruct/src/splat_render.hpp

applications/reconstruct/src/voxel_scene.cpp

components/common/cpp/CMakeLists.txt

components/common/cpp/include/ctpl_stl.h

components/common/cpp/include/ftl/threads.hpp

components/common/cpp/include/ftl/timer.hpp

components/common/cpp/src/configuration.cpp

components/common/cpp/src/ctpl_stl.cpp

components/common/cpp/src/timer.cpp

components/common/cpp/test/CMakeLists.txt

components/common/cpp/test/timer_unit.cpp

components/net/cpp/include/ftl/net/common.hpp

components/net/cpp/include/ftl/net/peer.hpp