- merge IRCView::basicDirection into IRCView::filter/ircTextToHtml
- Switch ircchar finding from QRegExp to for (...) in ircTextToHtml and also handle the baseicDirection
+ QRegExp seems to be very slow on long lines with very many matches, a simple for (...) is up to
  2 times faster in this case
+ baseicDirection check now skips urls, as they are not part of the spoken language
- remove temporary url marker hack