Support IddCx.h

A bit of background for my request, (specifically, I'm using iddcx 1.9)

So, I went ahead and followed the official idd sample driver and manually created bindings to the entire WDK and Idd for my driver project. And I got a working umdf driver now,

To that end, the specific functions I used since I couldn't find them in the generated bindings (and please correct me if I am wrong anywhere), are:

Idd:
IddCxDeviceInitConfig, IddCxDeviceInitialize, IddCxAdapterInitAsync, IddCxMonitorCreate, IddCxMonitorArrival, IddCxSwapChainSetDevice, IddCxSwapChainReleaseAndAcquireBuffer, IddCxSwapChainFinishedProcessingFrame

Wdf:
WdfDriverCreate, WdfDeviceCreate, WdfDeviceInitSetPnpPowerEventCallbacks, WdfObjectGetTypedContextWorker (this is internal, but I needed to recreate the WDF_DECLARE_CONTEXT_TYPE!() macro), WdfObjectDelete

Also had to manually export FxDriverEntryUm entry point to get the ball rolling.

Thanks for all your guys effort! I would absolutely love to throw away all my bindings 😄

Start by comparing the generated bindings with IddCx.h and the listed IddCx and WDF functions, then inspect the wdkmetadata generation path. Use the linked virtual-display-rs files as a reference for the missing declarations. Done means the generated output exposes the requested APIs, including the needed driver entry point and context support.