Add an incomplete navigator widget

We're also temporarily using this widget as a noop to implement other
widgets that are required by the current templates.
Stop using the "wikified" view format

It was special cased to be a synonym for transclusion. Keeps things
simpler to use transclusion explicitly.
Bit more of the reveal widget
Make the recursion markers a bit prettier

These are the markers used when qualifying state tiddler titles
Support for qualified state tiddler titles
Just use the new widget framework in the browser

If you run `nbld.sh` you now get an `index.html` that's built by the
new widget mechanism, and that uses the new widget mechanism in the
browser.

Now there's some gaps to fill in, but this is the home stretch…