v0.5.4

Adds one esb* class, esbCount, inside the eight section headings that carry
a count, and the bundle's first host-facing JavaScript,
window.esbBlocks.diagram. No block or parameter is renamed or removed, and no
existing selector stops matching; the one visible change is that the application
profile page no longer draws the renderer's corner flag.

Added

• The specification diagram is published as a promise,
  window.esbBlocks.diagram(specURI), for a host that renders the diagram itself
  rather than mounting diagramImage. It resolves with { entry, uri }, or
  null when there is no diagram. A block has to resolve it, so a page mounting
  none of diagramImage, specInspectAPButton or apView leaves it pending.
  Described under "Host-facing JS API" in src/README.md.
• A new esb* class, esbCount: a <span> around the count in the eight
  section headings that carry one, across the terminology, data vocabulary and
  specification pages. It holds the bare number in the specification's four
  headings, the whole count phrase in the other four.
• Two new parameters on apView, marginFlag (false) and tocControls
  (true) — data-entryscape-margin-flag and data-entryscape-toc-controls at
  the mount point. They reach the rdforms-specs renderer's corner flag and its
  ToC hide/jump controls, neither reachable from the mount node before.
  tocControls defaults to what the renderer already did; marginFlag does not
  (below).

Changed

• The application profile page hides the renderer's corner flag. apView
  passes marginFlag now, defaulting to false, where 0.5.3 passed nothing and
  the renderer drew it; data-entryscape-margin-flag="true" brings it back. A
  host hiding the flag in its own CSS should drop that rule: it left the 26px
  gutter reserved, and an !important there vetoes marginFlag="true".
• The eight heading strings carry markup. They were plain text; each now
  holds the esbCount span, in both languages. A host overriding one in
  config.nls has to carry the span along, and one reusing it elsewhere has to
  render it through a triple-stache — {{nls}} and esb_nls: escape the markup
  and print the tag as text, with no error. The keys are named in src/nls.js;
  the wording is unchanged.