* sly.el (sly-events-buffer): Robustify.
Bring back compound completion

* NEWS.md: Update.

* sly.el (sly-complete-symbol-function): "Compound style" option
points to `sly-c-p-c-complete-symbol'

* contrib/sly-fuzzy.el (sly-c-p-c-symbol-completions)
(sly-c-p-c-char-name-completions, sly-c-p-c-complete-symbol): New function.

* contrib/sly-mrepl.el (sly-mrepl-mode): Pass 1 to `sly-mode'
No longer trample REPLs

* sly-mrepl.el (sly-mrepl--teardown): Slightly cleaner teardown.