Animate meshes

[demlow]

Adds five animation buttons to the Layer dialog, between the "1 2 3 4" states buttons. The animation controls allow cycling visibility through all or a subset of the meshes. This helps when comparing meshes since flipping back and forth makes differences more obvious than side-by-side views, etc.

[alemuntoni]

Thank you for this PR! :)

[demlow]

Please let me know if there's a place to add documentation/help.

[luzpaz]

Any ETA on this?

[demlow]

If the maintainers ever decide to accept it, I should tweak the behavior a bit.

On Wed, Jul 12, 2023 at 10:20 AM luzpaz @.***> wrote:

Any ETA on this?

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[Nosenzor]

Please accept this PR ! It would be really helpful to demo and make video recordings

[alemuntoni]

I was not completely convinced at first, but I guess it is useful and the implementation is fine. I'm merging it and it will be available in the next MeshLab version. Thank you again, @demlow!