Enable near-point scrolling of widgets
Prefer popup menus over minibuffer selection

As most menu choices are better piloted using popup menus even for
a larger number of entries override the default behaviour for
the `folio-menu-choice' widget depending on the value of the
customization variable `folio-prefer-popup-menus'.
Wrap long lines
Properly handle the script filter being reset to `Any'
Fix busy loop when last key is not in current keys
Maintain filter state for both regex and GWL filters

Refactor dictionary filtering to maintain state for both the regexp
and the GWL filter.
Asynchroneously update dictionary widget

Asynchroneously update the dictionary widget when toggling the GWL
filter by scheduling the timer `dict-filter'.
Style: doc-strings