Add a point gaussian mapper for cosmology and cleanup
Add in a mapper that renders points as gaussian splats. In the future we can extend it a bit more to do other useful things. It colors the points and scales then based on arrays that are passed in. This patch also includes a performance improvement for the spheremapper so that it uses less memory. It is the same basic code as the point gaussian mapper which is why it is in the same patch. Change-Id: I8bce4446be063eb5d6a5eb4bc1a51e4369ba61cf
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