Change the generic_iterator scope to public. This fixes a Mac and Xbox compiler error.

git-svn-id: http://odamex.net/svn/root/trunk@4523 b0bcef46-2027-0410-bd56-ab726e9a1d04
Update Xbox project

git-svn-id: http://odamex.net/svn/root/trunk@4524 b0bcef46-2027-0410-bd56-ab726e9a1d04