AP_HAL_FLYMAPLE: Fix example Scheduler.pde to compile with recent changes to
scheduler API
AP_HAL_FLYMAPLE: Fix example Scheduler.pde fo recent changes to API
AP_HAL_FLYMAPLE: I2CDriver improvements to interrupt hygiene
AP_HAL_FLYMAPLE: UARTDriver Use new libmaple TX buffers.

Caution: requires latest libmaple from
git@github.com:mikemccauley/libmaple.git
AP_InertialSensor: Minor correction to comments in AP_InertialSensor_Flymaple.cpp
AP_HAL_FLYMAPLE: Improvements to RCInput

More reasonable sync pulse times, add input filter to prevent false triggering
AP_HAL_FLYMAPLE: Added new example test sketch RCInput.pde
AP_HAL_FLYMAPLE: RCInput now more robust in the face of connect/disconnect of
a PPM-SUM source

Also remove some left over debug code.
AP_HAL_FLYMAPLE: remove obsolete debugging code from RCInput