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.
- The requirements are collected by ModuleManager, checked
by an internal RequirementsChecker and changes to the
requirements state are all signalled from ModuleManager.
By connecting the requirements in the welcome modules' Config
only to their own configs -- and immediately checking them,
which is bad on its own -- we end up with a disconnect between
what the ModuleManager says about requirements, and what
the welcome modules report on.
- The Config object can handle GeoIP loading on its own. Both
View steps that used this had a derpy view->setCountry() that
didn't really do anything with the view anymore.
- can't convert lambda-with-captures to a function pointer (Clang 9)
- instead, use a context property .. QmlViewStep already sets a
"config" property with the Config object, but WelcomeQ wants it
as another name as well.
- this avoids registering the Welcome object across all QML pages,
as well.
NOTE: needs to have the QML adjusted for this change.
- The name is just the module identifier, and now we
search for *m@i* and also *m* from that identifier,
the name becomes much less important -- and it
can be set from the config key *qmlFilename* as well.
- The config context object should be set earlier, otherwise
QML code will try binding to a non-existent config already
- Document that QMLViewStep::setConfigurationMap() parent implementation
should be called **last**, at the end of the subclass implementation.
