* The functionality is exposed via dllexported functions so that apps can
call it to tweak renderdoc's behaviour when injects.
1) Can now turn bits of the overlay off, or hide it entirely.
2) Can also manually start and stop a capture on a given window. This
skips the need for swapping between active swapchains, and allows the
app to define the exact region of D3D11 calls to be captured (could in
fact be many frames).
The window provided determines the swapchain used for thumbnail, and
also implicitly specifies the device to be used for capture.
baldurk