PullMark 0.23.0

• Line numbers in rendered views — a new Appearance setting, off by
  default: each block shows its starting source line in the margin of
  rendered documents and diffs, with the block's full range on hover.
  Rendered text wraps freely, so numbering is per block — the rendered
  views' honest answer to "where is this in the file?" (the raw source
  view keeps its true per-line gutter). Diffs number by the new file;
  removed blocks keep their old-file coordinates, and side-by-side view
  numbers each column by its own side. Plays with blame: numbers sit
  nearest the text, history outside them.
• Appearance settings — the Themes settings tab is now Appearance:
  theme cards under their own header with the custom-theme controls
  beside them, and each layout choice — theme, content width, line
  numbers — presented as selectable preview cards.