* Update to use libcanard callback
Reworked param system with lambda
* Use callback instead of lambda saves 500 bytes of flash
* [UAVCANv1] Added ServiceRequest class, subscribers decoupled
* PX4 UAVCANv1 portID param default CANARD_PORT_ID_UNSET (65535U)
* [UAVCANv1] uORB sensor_gps modify timestamp for now untill we've got timesync working
* UAVCANv1 update parameter definition to use -1 as unset
Also add commented-out code for use with PR-16808
(MixingOutput + output_control)
Bench-tested PWM output on a Pixracer via UAVCANv1 ESC commands from a
Pixhawk 4.
Peter van der Perk