minor comment updates
updated method to compute date in YYYYMMDD format with CMakeLists.txt.
first checkin of serial rx support (spektrum and sbus)

- nanowii has dedicated serial port for satellite receivers
- #define NO_SERIALRX is undefined for nanowii, all other devices #define away the code
- added #define DUMP_SENSORS to enable serial and dump sensors after setup (for convenience)
- enabled SERIALRX_MODE config on both device and program box (bumped cfg_ver to 4)
- program box: display message if device cfg_ver does not match expected cfg_ver
- parsers for spektrum and sbus protocols (complete untested and undebugged)
added updated program box hex files

- new cfg_ver to 4
- SERIALRX_MODE parameters
- print ver mismatch if device cfg version does not match expected version.
Bug fixes and cleanups:

= program box (aquastar/dlux)
- add config version checking. program box must match firmware to proceed.

= FlightStab
- RX3S_V1 remap AILR_OUT pin to AUX_IN for DELTA and VTAIL as well.
- rename USE_SERIAL to SERIAL_DEBUG
- rename DISABLE_CPPM to NO_CPPM
- define DUMP_SENSORS
- use mapping table for DIP_SW to WING_MODE conversion, saved about 30 bytes.

= CMakeLists.txt
- generate consistent YYYYMMDD date order on win32, requires wmic binary.