Adding Some Bindings

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• BND_Sphere::ClosestParameter()
• BND_Circle::ClosestParameter()
• BND_Light::GetSpotLightRadii()
• BND_MeshFaceList::GetFaceVertices()
• BND_MeshFaceList::GetFaceCenter()

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@dalefugier Kindly requesting you review this code if you have some time as my c++ is pretty green.

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@sbaer give this a once over when you have a moment