filters: add ewa_lanczosradius and missing polar bc-splines #308
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Ewa_lanczosradius is an interesting filter because it produces results that are roughly as sharp as those of ortho lanczos, while being slightly faster than ewa_lanczossharp since it has a shorter radius. The naming convention comes from ImageMagick and I believe it's supposed to indicate that it has an integer radius (3 in this case).
The missing named BC-Splines were added as well to make them more convenient to access. I don't think they're that useful in general, but having them defined probably doesn't hurt.
I wanted to open this on the actual repo instead, but my VideoLAN account is stuck in approval limbo. If you think this is an unnecessary addition please feel free to close. The functionality already exists, these changes only make these filters easier to use.