- the Page displays a simple message describing what the
summary is all about; Config has the same message,
use that. Needed some re-jigging to get the signals
and slots right.
- Create Config object, even if it's not used just yet
- Introduce onLeave() for the Page, better name than
(re-)creating the content (!?) when leaving
- 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.
- Let's just have one header definining export- and visibility-
macros for Calamares. They are still selected based on the
export flags (*_PRO), just defined in one header instead of two.
- These methods are used for multi-page view-steps, which are rare.
For all the others, just drop the empty implementation and defer
to the base class.
