Initial non-tested code for reading from the ESC.
Refactoring of the hott telemetry driver and added functionality to read from a HoTT sensor.
Add in missing files.
More cleanups
Merge remote-tracking branch 'upstream/master' into hott-esc
First stab at IOCTL driven offset handling (in PA) for all airspeed sensors. Untested
Minor initialization / formatting change
Reworked airspeed driver to keep most of it abstract
Major refactor of HoTT drivers and finished sensor read implementation.
Merge remote-tracking branch 'upstream/master' into hott-esc
Whitespace cleanup
Remove unused code.
Reduce the max stack size needed.
Merge pull request #337 from sjwilks/hott-esc

Driver for the reading Graupner HoTT sensors (such as their ESC range) via the telemetry port
Fixed last few compile errors, ready for testing
Merged
WIP on MEAS bringup, ETS airspeed sensors should be operational
Implemented new, simple system boot config and sane default value system based on two parameters evaluated at boot time
Removed unneccesary casts in airspeed calculation to double precision
Added saving of default values once loaded