* sly.el: Fix typo.
Enhance sly-stickers replay feature (C-c C-s C-r)

* contrib/sly-stickers.el (sly-stickers--process-sticker-description):
Always flash sticker, even if not popping to it.
(sly-stickers--fetch-and-replay-map): New variable.
(sly-stickers--fetch-and-replay-help): New helper.
(sly-stickers--fetch-and-replay-1): New helper.
(sly-stickers--fetch-and-replay-map): Rework loop to allow more
navigation options.

* contrib/slynk-stickers.lisp (:slynk-stickers): Make sure to export VISIT-NEXT>
(next-index-and-recording, visit-next): Allow travelling back in recording history.
(describe-recording-for-emacs, describe-sticker-for-emacs)
(visit-next): Add a docstring.