Adds support for "pnts" tile content

[nithinp7]

fixes: #333

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[cesium-concierge]

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[cesium-concierge]

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[j9liu]

This PR is outdated; instead of creating a ___Content class this should be implemented as a PntsToGltfConverter. I'm going to close it and open a completely new one once enough progress has been made.