*/*: Remove qtbuilder and sip from RUN_DEPENDS

devel/py-qtbuilder and devel/py-sip should only be used as a
BUILD_DEPENDS. (e.g. USE_PYQT=qtbuilder:build sip:build)
Usually, these are only used to build the PyQt framework, but a few
other ports need them to build. Ports that have them as a BUILD_DEPENDS
unnecessarily haven't been audited yet.

Sip used to be needed for run, but this hasn't been the case for quite
some time. Runtime is provided by the devel/py-qt[56]-sip ports.
(USE_PYQT=pysip). The main PyQt ports provide this automatically, so
it isn't necessary to add it to individual consumers.

While here:
www/onionshare: Remove PyQt stuff completely. It uses PySide.

With hat: kde@