Signed-off-by: Claudio Micheli <claudio@auterion.com>

Added COM_ONB_LOSS_T and COM_ONB_REG_T parameters to specify thresholds that triggers "onboard link lost" and "onboard link regained".


Signed-off-by: Claudio Micheli <claudio@auterion.com>

Major changes:
- Prevent  "HIGH LATENCY DATA LINK LOST" message to appear if iridium telemetry is not used.
- Prevent "DATA LINK LOSS" mavlink messages flooding when QGC is open and then closed.
- Changed "DATA LINK REGAINED" condition (use _datalink_last_heartbeat_gcs insthead of _datalink_lost)



Signed-off-by: Claudio Micheli <claudio@auterion.com>

 - closes #10133

Yaw airmode w/o arming switch is most likely not what you want and will
lead to surprising results.

after review comment request from @dagar. Thanks!

- use pragma once guard in FailureDetector.hpp
- send Commander parent to ModuleParams and remove update_params() method
- simplify attitude checks
- FailureDetector::get_status() (previously named "get") is now a constant method that returns a constant reference

FailureDetector - New class, first working simple implementation. Outputs PX4_ERR messages if roll or pitch is exceeded.

- Move publishing the telemetry status from the IridiumSBD driver to the mavlink instance
- In the commander use the iridiumsbd_status message for heartbeat in case of a high latency link
- Move positive acknowledge to the mavlink instance
- Add a failed acknowledge in the commander if no high latency link exists

 - add preflight_check helper

 - this helps tease apart the various pieces of commander.