tracediff: Don't highlight differences if the call nos are actually the same.
retrace: Allow multiple levels of debugging checks.
d3dretrace: Enable D3D9D when additional debug is requested.
d3dretrace: Terminate when CreateDevice fails.

Like we do for D3D10+.
d3dretrace: Force windowed mode on D3D9 traces.

Because there is no guarantee that the display mode is available.