Handle a third-party datasets in a similar way across many providers

[davenquinn]

Right now the Macrostrat web interface has the ability to showcase data from the Paleobiology Database. However, there are many other data providers which we are building integrations with. We should be able to display data from all of them, with some capabilities to link to the geologic framework. This will require:

• A standard way of organizing the APIs for features (probably vector tiles with server-side clustering)
• A standard format for displaying information in the sidebar so data displays can be added easily
• A specification of links (e.g., age, stratigraphic unit) that should be assigned to data to enable filtering capabilities

Once we have the basic framework, it should be relatively easy to add new integrations and communicate what is required for other organizations to provide data in the right formats.

[davenquinn]

Several features of the PBDB integration are broken in the development version of the website, so these will have to be fixed in order to properly address this.