Added initial implementation of class NtHandle.

git-svn-id: https://fallen:8443/svn/ntnix/ntnix/trunk@16 24d2b540-2039-5a44-a0d7-d7bc2ff27355
Removed 'Mixed platforms' and set x64 to be as default.

git-svn-id: https://fallen:8443/svn/ntnix/ntnix/trunk@17 24d2b540-2039-5a44-a0d7-d7bc2ff27355