- This is utility code, so it can be in the QML "service"
from Calamares, rather than in the QmlViewStep itself.
That makes it usable for other QML bits as well.
- Different libraries should have different EXPORTs, so that
you can IMPORT one while building the other. Reported (and
kindly explained) by Kevin Kofler.
- Stick to one header file, though.
While here, update copyright on file.