Integrate Debian packaging changes

debian/control:
* restructure to make it easier to incorporate further changes
* update package descriptions
* move build-depends to a proper place
* update project URL

debian/rules:
* use proper hardening syntax
* strip linker option without explicit shell invocation
* remove useless comment
* add extra cleanup

debian/: package documentation separately

debian/docs: remove empty file

debian/coryright: update to match Debian format

Change-Id: Ia7654d34730e9f269831612bfba70a1338ce29d3
Related: OS#1694
14 files changed