Ardour
Static waf changes
To help land https://github.com/Ardour/ardour/pull/663, let's continue with cleanup of some things that automatic or manual static analysis shows as unused.
This is mainly removing unused stuff. This gives less code to maintain and helps making the important things more visible.
See and review (and cherry-pick) the individual changes.
pyflakes will quite reliably catch many potential problems in such cleanup. Just running any build command will also cover most of these changes. As additional testing, I suggest running a build and verifying that rare build targets such as i18n updates and release scripts work as usual. I'm less familiar with how this usually works and there could be changes or use cases I failed to notice.
