The create thread functionality would work in all cases except where
the thread was being created in an x64 process from an x86 process.

This commit adds support for this by reusing the wow64 injection code
in this case.

DWORD was being used, resulting in x64 being unhappy thanks to
pointer truncation. This fixes the problem.

The goal is to avoid pointer truncation where possible so this commit
changes parameter types to qword where it makes the most sense. This
includes all handles (event, process, thread, registry), addresses
and generic parameters.