ddraw/tests: Add some tests to show that we should maintain D3D state across cooperative level chnages.

Some drivers use the neighbouring pixels in the interpolation. You can
probably argue about whether that's right or wrong, but it's really not what
we're trying to test in either case.

The GLSL constant tracking needs these to be correct.

wined3d: Don't print an ERR if the depth/stencil surface still has references in wined3d_device_uninit_3d().

This is completely legitimate in ddraw.