Mpi Grow Mask With Blur

# Grow Mask With Blur - mask: input mask or mask batch - expand: grow (positive) or shrink (negative) the mask by this many pixels - incremental_expandrate: raise the expand amount by this much per frame - tapered_corners: plus-shaped instead of square growth - flip_input: invert the input first - blur_radius: above 0 blurs the mask (8-bit result) - lerp_alpha / decay_factor: blend each frame with the previous one - fill_holes: fill holes in the mask (slow)