Aquisition module status methods

[ksunden]

There should be methods for how to handle various aquisition exit conditions:

on_success for completed scans: This is where, e.g. curves get set automattically as in autotune in PyCMDS
on_failure
on_interrupt

These and others like them will enable elegant handling of various exit conditions for an acquisition. (And prevent things like curves from being automatically applied, even when the scan was halted midway through)