Make a generic odd pointy scaler.
Since we have all odd numbers thanks to the pointy scaler, and we
have 2x thanks to xBR, we should now be able to build any integer
scaling from a combination of those two scalers.
This, of course, assumes you have enough CPU and RAM to actually
do the scaling you want... powers of two will likely be the worst
case for scaling.
Also, do pointy scaling before xBR.
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