Port Settings to KConfigXT
This allows to use the settings from both c++ and QML, whithout having to write all the boilerplate code that we had in BrowserManager with QSettings. Settings can still be accessed from QML using properties, and dynamic defaults based on isMobile are also possible.
Downside: As the code currently is, we lose all existing settings (excluding everything that is stored in the database)
Edited by Jonah Brüchert