Reduce some cppcheck warnings

CMakeLists.txt

applications/calibration/src/common.hpp

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

components/common/cpp/src/timer.cpp

components/common/cpp/test/timer_unit.cpp

components/net/cpp/src/peer.cpp

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

components/rgbd-sources/src/middlebury_source.cpp

components/rgbd-sources/src/middlebury_source.hpp

components/rgbd-sources/src/realsense_source.hpp

components/rgbd-sources/src/snapshot_source.hpp

components/rgbd-sources/src/source.cpp