AMD drivers reject system memory surfaces that are larger than the maximum
texture width/height supported by the driver (usually 4096x4096 for AMD).
This can cause issues in games that create larger system memory surfaces.
This workaround crops the driver resource dimensions to the allowed
maximum values and handles blitting outside this region by creating a
temporary resource that maps to the actual affected system memory region.
Fixes crashes with AMD drivers in Rainbow Six games and Desperados,
mentioned in issue #2 and #8.
Disabled the indication of mirrored blit support via the driver GetCaps routine
as this may be reported as supported on modern GPUs even when it's not.
Removing this indication allows the HEL (Hardware Emulation Layer) to correctly
handle all mirrored blits. It also seems to perform better than the previous
clumsy line-by-line mirroring emulation.
