This also fixes unreported issues unrelated to the 7.4.0 release:
- (now old style "lightbox") admonitions render badly in tabulary,
- "heavybox" admonitions (they are all now but warning et al. were already) cause PDF crash if in tabulary and rendered badly if in tabular or longtable.
- figure in a table cell is not properly separated from immediately preceding text.
Co-authored-by: Adam Turner <9087854+aa-turner@users.noreply.github.com>
This commit adds a `level` option to the `rubric` directive, which propagates a `level` attribute to the `rubric` node,
and allows renderers to select a specific heading level.
Logic for this attribute has been added to the HTML5 and LaTeX builder.
- Remove now-removed configuration values
- Use obvious 'unset' defaults for ``project`` and ``author``
- Prefer 'e.g.' to 'ex.'
- Allow non-list sequence types in various configuration values
- Add types and defaults to every confval directive
