Expose the orientation selection in the calibration GUI (v2)

[kif]

close #2005

[vallsv]

You should create a dedicated class for the orientation.
You can feel like it is overkill, but that's the way not to be over bloated with implementation details after years.

• set/get will deal with your enum values, you don't have to think about
• you can put your component inside detector-selection-drop.ui directly

Except that, if it works, it works.

[kif]

The modification you suggest has been put into #2027