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matching convention for fixed length api, eg: copy_v3_fl
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Following problems:
- painting onto a cube asserts immediately (vpaint/wpaint)
- crashes with valgrind (bad memory use)
- the original intended behavior of vertex projection paint no longer works as I intended.
(its constantly refreshing geometry even when no modifiers are applied).
Best get code review for these kinds of changes.
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Issue here is that coordinates used for projection would not fit the
closest candidate. So it was possible to paint against the mirrored part
of the mesh, which would get clipped on reprojection.
Fix avoids reprojection by storing squared distance, and screen space
coordinates, which we will need again later anyway. Also we now always
paint against the closest vertex always. This is ensured because squared
distances for uninitialized vertices will be MAXFLOAT, thus failing the
strength test.
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foreachMappedVert/foreachMappedFaceCenter when needed,
this means in editmode with wire draw, face and vertex normals don't have to be calculated at all.
in most cases the normals are not used so add a flag that makes calculating them only for functions that need them.
also fix face normal calculation for CDDM, was using quad calculation for ngons too.
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old limitation where you could only paint onto one side of a mirrored mesh (weight paint, vertex paint).
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