enable Wshadow

cmake/common/px4_base.cmake

src/drivers/camera_trigger/camera_trigger.cpp

src/drivers/pwm_out_sim/pwm_out_sim.cpp

src/drivers/px4fmu/fmu.cpp

src/drivers/snapdragon_rc_pwm/CMakeLists.txt

src/modules/commander/CMakeLists.txt

src/modules/commander/commander.cpp

src/modules/commander/mag_calibration.cpp

src/modules/mavlink/mavlink_parameters.cpp

src/modules/uORB/uORBTest_UnitTest.cpp

src/modules/uavcan/CMakeLists.txt

src/platforms/posix/drivers/accelsim/CMakeLists.txt

src/platforms/posix/drivers/airspeedsim/CMakeLists.txt

src/platforms/posix/drivers/barosim/CMakeLists.txt

src/platforms/posix/drivers/gpssim/CMakeLists.txt

src/platforms/posix/drivers/gyrosim/CMakeLists.txt