[FEATURE] Experiment with Pixhawk features

[benjaminwp18]

Is your feature request related to a problem? Please describe

Pixhawk supports things like motor slewing and autonomous flight (?), but we're not using them

Describe the solution you'd like

Implement Pixhawk slewing with the Pixhawk. Experiment with its other features and document findings on this ticket. Create other tickets or make small changes here as necessary.

Depends on

#16

[InvincibleRMC]

Depth Hold would be cool