Adapt the security kernel module to NT6+ compliance

Starting with Windows Vista and later versions, there have been lots of stuff added into the SE module of the kernel. Hash SIDs, mandatory integrity levels, improvements to sandboxing, newer token information classes and a whole lot more.

This ticket aims to keep track of the whole current progress being made. It'll be marked as solved as I see fit, when SE is enough to be considered compliant with the newer NT6+ APIs.