Improved KeyframeMesh AABB support

When you use KeyframeMesh::SetPosition(frame, vertex, pos), it will now
invalidate the frame AABB.
Finish() method will now generate automatically invalid AABBs before
interpolating


Former-commit-id: aa4695cee635da73e4a3b70ce22e83b1c3f443f9

include/Nazara/Utility/KeyframeMesh.hpp

@@ -26,6 +26,8 @@ class NAZARA_API NzKeyframeMesh final : public NzSubMesh
 
 		void Finish();
 
+		void GenerateAABBs();
+
 		const NzAxisAlignedBox& GetAABB() const override;
 		nzAnimationType GetAnimationType() const override;
 		unsigned int GetFrameCount() const;