rewrite of the file open dialog, now it enters a directory instead of trying to open it in Geany (closes #1421776), improved the find and replace dialog, an existing selection is inserted, fixed focus settings


git-svn-id: https://geany.svn.sourceforge.net/svnroot/geany/trunk@188 ea778897-0a13-0410-b9d1-a72fbfd435f5