#25 Implement file permissions on NT

[Dean Roddey]

CIDLib uses the Unix style file access permission (i.e. world, group, owner) when a new file is created. Under NT, this should be kind of faked using the NT security system, i.e. set the security on the file to basically match the semantics of the Unix scheme. For Group, find the groups the user is part of and given them the indicated access.

Not sure how cleanly this will work, but its better than nothing.