Make plugin function msgwin->status_add() not set the statusbar - but
ui->set_statusbar() can now be used to do both with the log argument.
After Geany 0.12 this is how the core versions of those functions
will work, so the status window can be set independently.


git-svn-id: https://geany.svn.sourceforge.net/svnroot/geany/trunk@1903 ea778897-0a13-0410-b9d1-a72fbfd435f5