Ability to disable classes and properties (based on a single provided statistics count)

[tfrancart]

Sparnatural could offer the possibility to disable certain classes and properties based on the statistics that are computed automatically by SHACL Play (see https://shacl-play.sparna.fr/play/generate#documentation)

The corresponding entries would appear disabled (greyed out) in the list.

This is useful for Open Archaeo where there is a single page for each dataset, but always with the same config. The config could be filtered in this case to show only the available entities in the dataset.

[tfrancart]

This is requested by the OpenArchaeo project

[tfrancart]

To be done with the newest hierarchical tree selector