implement defining exceptions for manager taking buildings on/offline

The manager will never take the defined exceptions on- or offline
but leave them for manual handling instead.
There are buildings for which it is way too hard for the manager
to decide whether they should be online, which forces the player
to not build them or to not use automatic on/offlining in that system
(until now).
Revert "don't take scanners on/offline"

And make Continuum Scanner a default to add exception.

This reverts commit fbbbcae2c6c95fc6ad08b67eb212e66581d6f0f2.
automatically adapt exceptions in case of an upgrade