Task: Move c++ modules to libpapyros and sddm to own repository

[ricardomv]

Modules like Desktop and Network can be moved to libpapyros so that we don't have to mix c++ and qml files.
With this change the sddm theme can also be moved to a different repository.

@ibeliever do you agree?

--- Want to back this issue? **[Post a bounty on it!](https://www.bountysource.com/issues/31942998-task-move-c-modules-to-libpapyros-and-sddm-to-own-repository?utm_campaign=plugin&utm_content=tracker%2F8658931&utm_medium=issues&utm_source=github)** We accept bounties via [Bountysource](https://www.bountysource.com/?utm_campaign=plugin&utm_content=tracker%2F8658931&utm_medium=issues&utm_source=github).