- Remove code that is duplicated in Config.
- Hook up UI for physical keyboard model, and back.
- For now, introduce some named slots with debugging output.
This makes debugging a lot easier since we have function names
to work with rather than anonymous lambdas
The .ui files are all GPL-3.0-or-later style, but it's
slightly difficult to keep licensing information in them:
it's XML, so an XML comment might work, but there's no
guarantee that safe/load will preserve them.
Put the SPDX tags in the <author> tag, so that it's visible
in Qt Designer.
