WIP: CMake build

[nolyn]

I added a cmake file which allows to build the project. I also updated the CI workflows to use it. Shouldn't merge it right away, since there are still some things to think about:

• Do we replace the old build system (qt project files) or keep it?
• Kept the old CI release uploads for now. New ones are added alongside
• The unit test didn't work on the windows workflow, but I can not debug it since I don't have windows system.
• Do we want to integrate any sanitizers? See http://www.stablecoder.ca/2018/02/01/analyzer-build-types.html. Could also add this later on.
• Possibly more that I don't have on my mind right now.

[nolyn]

Setting the version/hash with cmake and git describe/rev-parse should now work