In order to avoid deep copies, Qt containers over which we iterate must be const
The remaining unported cases require qAsConst (Qt 5.7) or std::as_const (C++17)
This commit adds support for distribution to define sidebarTextHighlight to their
branding.desc file, to control the left panel (sidebar) with highlight behind the
current step (isCurrent) text label.
URL is a variable set in branding.desc, distros cna link to a Known Issues page
text for the URL is also possible to set in branding, known issues is default
advantage is any text possible as distros see fit
disadvantage, not part of translated strings
if most agree, Known Issues can be set as hard coded text, not in branding.desc
The method creates a map called "branding" in the global storage, and
inserts an entry for each of the branding strings. This makes the
branding information accessible to the Python modules.
The method is called by CalamaresApplication::initJobQueue.
This is necessary because the Branding class is in libcalamaresui, so
Python modules cannot access it directly.
