- point to main Calamares site in the 'part of' headers instead
of to github (this is the "this file is part of Calamares"
opening line for most files).
- remove boilerplate from all source files, CMake modules and completions,
this is the 3-paragraph summary of the GPL-3.0-or-later, which has
a meaning entirely covered by the SPDX tag.
- Add a (superfluous, since they don't have their own signals or slots)
Q_OBJECT macro to the VG jobs, to silence a Transifex warning (this
does make sure that the tool knows about the context for the translated
messages)
