LazUtils: Move GetAppConfigDirUTF8 and GetAppConfigFileUTF8 to LazFileUtils (and inline them in FileUtil).
Part of the ongoing restructuring of LazUtils.


git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@41589 4005530d-fff6-0310-9dd1-cebe43e6787f