arduino-cmake support part 1
- added the cmake directory (should add a git subproject)
- CMakeLists.txt to generate rx3s_v[1/2] at [8/16]mhz
- rearranged the header section of FlightStab.ino. need to refactor out the device definition into a separate file.
= build targets in ./Builds dir and not ./build
- remove ./build/*.hex
- add ./Builds/*.hex

= minor changes to printing in dump_sensors()