- set integral states and setpoint of reference state to 0
- set thrust to NAN if it will be computed from position and velocity control

obstacle_distance: update distances description according to latest obstacle_distance mavlink message

added unseal() and seal() around write_flash() for enabling/disabling cell undervoltage, we found out today this wasn't being written because that address is in protected flash

commented out something causing trouble with CI, it is in an unused function but I'd like to keep the comment there as a reference for future development effort

* lis3mdl: Report calibration successful when starting with -C option
* lis3mdl: Use PX4_OK, PX4_ERROR for return value / orb_unadvertise
* Fixes #10740

This change has two effects:
1. We always acknowledge a param write no matter if the value was
   actually changed or not. This is according to the spec:
   https://mavlink.io/en/services/parameter.html#write-parameters
2. This fixes the bug where int32 parameters were not actually acked
   because the memory of the param value was casted directly to float
   and then compared. In the case of a int32 parameter set from 0 to 1
   it would mean that the cast to float of the memory representation
   was still 0 and therefore it was assumed to be "no change" and the
   ack was omitted.