Moving the command handling to a separate function that gets called
whenever a vehicle command is available to always react on commands
and not just when already a task is running.
This solves e.g. commanding an Orbit when in Staibilized.
It is important that setpoints get initialized with NAN and not overwritten
if specifically set by a successful flight task execution. It's then
clear if any setpoints were intentionally and successfully set.
Crucial for the position controller's emergency failsafe and the
seamless setpoint handover to the next flight task.
- parameter updates can be quite expensive because they trigger nearly all modules to reload all of their parameters immediately
- limit modules from updating faster than once per second
