Work on px4io firmware building.

.gitignore

CMakeLists.txt

Makefile

cmake/common/px4_base.cmake

cmake/configs/nuttx_px4fmu-v2_default.cmake

cmake/configs/nuttx_px4fmu-v2_simple.cmake

cmake/configs/nuttx_sim_simple.cmake

cmake/nuttx/px4_impl_nuttx.cmake

cmake/toolchains/Toolchain-arm-linux-gnueabihf.cmake

cmake/toolchains/Toolchain-arm-none-eabi.cmake

cmake/toolchains/Toolchain-native.cmake

src/drivers/ms5611/CMakeLists.txt

src/firmware/nuttx/CMakeLists.txt

src/modules/px4iofirmware/CMakeLists.txt

src/systemcmds/tests/CMakeLists.txt