Add PID adjustment from AUX transmitter channel (#5584)

Add PID adjustment from AUX transmitter channel (#5584)

* Scale PIDs using aux channels

* Add control via variables and documentation

* Use USE_TXPID

* Removed OWNER_TXPID

* Use PWM_RANGE_MIDDLE

* Fix typos

* Move Tx PID arrays into pidProfile_t

* Move macro to pidUpdateRate function

* Enable TXPID on REVONANO

* Add support for direct setting of adjustments from aux channel

* Change variable name from adjustmentScale to adjustmentScale to avoid confusion

* Update documentation

* Change variable name from adjustmentScale to adjustmentScale to avoid confusion

* Only adjust settings if adjustment channel has changed value

* Fix formatting

* Use pidAudioModes_e type in ADJUSTMENT_PID_AUDIO setting. Only allow absolute override of settings of ADJUSTMENT_MODE_STEP.

* Add example 6

* Fix checking of adjustment mode

* Fix USE_PID_AUDIO code. Broke SPRACINGF7DUAL.