Handle fetching DX11.2 interfaces, but just as passthru. Closes #106

* Until I have a sample that uses it, I'm not going to attempt to serialise
  the tiled resource API. It has a lot of other potential knock-ons too
  (e.g. to initial contents).
Defensively code against queries failing to create.

* Received a crash report that indicated some queries failed to create,
  which means uninitialised pointers would be used from then on (= boom).