rhi: d3d11: Add the device lost testing machinery

The device can be lost when physically removing the graphics adapter,
disabling the driver (Device Manager), upgrading/uninstalling the
graphics driver, and when it is reset due to an error.

Some of these can (and should) be tested manually, but the last
one has a convenient, programmatic way of triggering: by triggering
the timeout detection and recovery (TDR) of WDDM. A compute shader
with an infinite loop should trigger this after 2 seconds by default.

All tests in tests/manual/rhi can now be started with a --curse <count>
argument where <count> specifies the number of frames to render before
breaking the device. Qt Quick will get an environment variable with
similar semantics in a separate patch.

Change-Id: I4b6f8d977a15b5b89d686b3973965df6435810ae
Reviewed-by: Christian Strømme <christian.stromme@qt.io>

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