Baobab trees rocking in the wind

[Salesome]

When playing an African style map, I noticed that the Baobab trees rock in the wind. This is unrealistic since they are pretty unflexible with their giant trunks.

It would be great to turn off the animation for Baobab trees, or, as a more general solution, to be able to turn off animations for certain tree types (don't know if that's possible as of now).

[wowgetoffyourcellphone]

In 26550:

[art] Stopped dead Baobabs from swaying in the wind.

refs: #6423