Lift certain incorrect assumptions about the order of vertices in
an OBJ file when processing vertex colors, which could lead to
missing or randomly permuted colors.
Replaces the list-of-blocks representation, attuned to assumptions
that the verts in an object form a contiguous subrange, with a
flat array better suited for random-access.
Co-authored-by: scurest <scurest@users.noreply.github.com>
Pull Request: https://projects.blender.org/blender/blender/pulls/126065
86e7668b11