MeshPolygon: fix the normals.
one more fix for displaying normals.
Fix bug which prevented the normal vectors from being drawn.Bug introduced in 2021/Dec/16!
build for API 34.
Completely kick out the android.opengl.Matrix dependency from the library.
Implement the android.opengl.Matrix functions ourselves.
Make the touchable part of the 'coin' in the CoinTetrahedroon a bit smaller.
Decouple (to a large degree) the OpenGL Library from Android.
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