This is important to have the probation times set up correctly and to silence land detected messages for systems that are not actually flying and just on the bench.

The goal is to force developers to use the correct target with the correct flash size. This prevents criticial functionality missing and is in particular important for FMUv2/FMUv3 boards. It is unmaintainable otherwise for the Pixhawk series.

It's important that any reader of the file knows about the ongoing refactoring.

* add COM_TAKEOFF_ACT to optionally switch to mission after takeoff