Create .deb packages with CPack
Debian packaging based on AppImageLauncher's CPack scripts.
@azubieta here's a few TODOs for you:
- fix metadata in
cmake/cpack_*
- make it work with Qt from trusty (or, better as in "it's time to upgrade anyway", xenial)
- set up uploading to Travis CI
For obvious reasons, using the Qt PPAs is impossible when intending to provide packages, otherwise a dependency on these PPAs is created which Average Joe doesn't necessarily want to install (read: unwanted/unnecessary complexity). Please try to get rid of those. Installing KF5 from source is not a problem as long as you link to it statically. As the whole thing doesn't compile on my system without installing some annoying dependencies, I didn't test these aspects. I just tested with a "hello world" program without dependencies.