Rename SpineMaterial to SpineMaterial2d and add SpineMaterial3d#31

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Mattincho wants to merge 1 commit intojabuwu:mainfrom Mattincho:fixing_examples

+333-228

Commits on Jan 7, 2025

Fixing examples. For 3d i created a copy of SpineMaterial to work with StandardMaterial.
Mattincho
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