Token query types and performance optimizations about wil HOT 1 OPEN

When I first added these helpers, templatizing on the type seemed right; instead, I should have templatized on the info class instead, and used that to imply the output type. I'll look into adding a variants that do that.When C++20 constexpr is enabled it should also make the code denser.

At the time, the goal was to avoid allocating more than necessary in the common case. The OS had lots of the "dual call" sequences, so I just lifted them all into this method.

However, I can see a parallel set of types that have a fixed buffer inside them that provide the T result on a block of bytes, appropriately aligned.

from wil.