distro/pkg/deb: deep clean Debian packaging with pedantic lintian

I've used apkg lint --pedantic to eliminate all lintian --pedantic --display-info cries.

Amongst other things, I've changed from manual meson/ninja invocation to using it through debhelper with --buildsystem=meson.

Only one last info message regarding python/knot_resolver/utils/modeling/README.md is left:

I: knot-resolver6: package-contains-documentation-outside-usr-share-doc [usr/lib/python3/dist-packages/knot_resolver/utils/modeling/README.md]
N: 
N:   This package ships a documentation file outside /usr/share/doc Documentation files are normally installed inside /usr/share/doc.
N:   
N:   If this file doesn't describe the contents or purpose of the directory it is in, please consider moving this file to /usr/share/doc/ or
N:   maybe even removing it. If this file does describe the contents or purpose of the directory it is in, please add a lintian override.