The Config object can hold all of the configuration information,
including also the requirements-checking parts. Move requirements-
checking configuration there, so it is shared and consistent
across welcome and welcomeq, regardless.
This repairs the test that expects the Config object to handle
**all** of the configuration, too.
- 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.
- Move widget behavior into its own container / widget class
- Change the RequirementsChecker class to just check the
requirements, returning a results list
- Connect from the module manager to the results widget.
