Qt4 and Qt5 build

Added source from qca repo @kde via submodule.
Added packaging files for Qt4 and Qt5 version.
Build works, I tested both builds in my home obs project.
However, I didn't test the results on the device yet.

Edit: I did some testing and changed the installation such that the plugins are installed beneath the Qt prefix.
Unfortunately, due to some issues with obs, I couldn't test the full package yet.

Edit2: Tested the full qca package on Nemo. It works.