New flight-rnh compiler + other features

Added ethernet to flight-rnh
Added first attempt at sleep mode from ACOK
Merge branch 'master' of github.com:psas/stm32
Merged PWM, pwm_exp, pwm_mod into pwm

Cleaned up functionality to make it more specific to just a demo
of the pwm.
Merge branch 'master' of github.com:psas/stm32