i got rid of slot support-text in message-window, so that class does
not maintain a state.
- changed behaivour of split-line
(split-line (format nil "~2%")) ; => ("" "")
That is an emtpy line is returned as empty string and not skipped
Thanks to people from IRC and cl-ppcre maintainer for help!
- [breaking changes] changed 'hooks:*before-prepare-for-rendering-message*
with 'hooks:*before-rendering-message-text*.