LazUtils: Move ConsoleToUTF8, UTF8ToConsole, ParamStrUTF8,
GetEnvironmentStringUTF8 and GetEnvironmentVariableUTF8 to LazUtf8 (and inline them in FileUtil).
Part of the ongoing restructuring of LazUtils.


git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@41587 4005530d-fff6-0310-9dd1-cebe43e6787f