v1.9.2

Release v1.9.2

CHANGES
- The default drag ghost shows its label centred, at the size the dragged item shows its own text, and grows to
  fit a label longer than the item - before, the label sat in the top-left corner at the base size and a longer
  one ran out of the ghost. Apps with a draggable's default ghost see this (no API change; a custom preview, such
  as VirtualMatrix's, is untouched).
- The showcase's drag chips carry the payload their labels show ("Text A", "Widget").
- README: crymble-ui in the browser at the very top - a live-demo badge, "Try the showcase in your browser"
  (https://wolfgang371.github.io/crymbleui/); the web how-to moved to the reference part, linked from New Features.

NOTES
- Windows: the whole spec suite type-checks for Windows; runtime behaviour on Windows is verified by CI on this
  release.