Now that we allow multiple color format buffers to overlap, and don't
just take one and change its format during copy for example, we could
use some additional checking.
Additionally, do a simple heuristic to reject "obviously" wrong copies
copies to framebuffers.
Fixes#15959, should also help #16124
Solves the last problem with the speedometers - so we can finally say: Fixes#8509
Render-to-CLUT for speedometers renders on top of an image that just comes from the
underlying memory, so it's been drawn to the framebuffer with DrawPixels. That adds
filtering so at higher resolutions, there's some blurring of the CLUT, causing
artifacts. We can solve this two ways: either we force on lower-resolution-for-effects
for Ridge Racer games, or we use nearest filtering when doing DrawPixels of the
memory under a framebuffer. For best result, we do the latter.
(The speedometers look even better with nearest filtering, but that's a more
general issue of UI looking better that way).
The displayFramebuf_ might not be set yet, but that doesn't mean we want
an INVALID format and zero stride. We might also be rendering to a
different target, but still want the display.
