* Expand the abilities of the GetTextureData in replay drivers
to be able to resolve samples and render down to RGBA8 unorm
for file export to other programs.
* Greatly improve the ability to save textures - in theory any
texture format/type/dimension/etc should now be mappable in
sensible & useful ways to output formats.
* Also for float/unorm texture add an additional "resolved" option that
just does an unweighted average of all samples, which is the behaviour
from before (assuming that's what ResolveSubresource does).
baldurk