net-im/kaidan: Add missing KDE deps

Add a metric ton of missing KDE dependencies. I know a few deps slip
though the cracks when kdelibs are updated and that's understandable,
but I really don't know what to say here. Just surprised it ever built.

Update WWW.

Add LICENSE and LICENSE_FILE.

Convert BUILD/LIB_DEPENDS=foo to USES_KDE=kirigami-addons.

Pet portlint(1) and portclippy(1).