Part of overall "improve filtering situation" (#116980) task:
- Add "Cubic Mitchell" filtering option to VSE strips. This is a cubic
(4x4) filter that generally looks better than bilinear, while not
blurring the image as much as the Cubic BSpline filter that exists
elsewhere within Blender. It is also default in many other apps.
- Rename the (very recently added) VSE Bicubic filter option to
Cubic BSpline.
Aras Pranckevicius