Add Neatline exhibit settings for site inclusion and routing

[akstuhl]

As a Neatline for Omeka S user, I want to create and view an exhibit within the scope of a particular Site in my Omeka S instance.

Question for team: do we support associating a single Neatline exhibit with multiple Omeka sites?

• add an “associated resource(s)” field/association to the exhibit API schema so that a Site ID can be attached
• filter exhibits list by the Site specified in URL when viewing the SPA inside an Omeka instance
• automatically assign the Site specified in URL as a new exhibit’s associated resource when using the SPA inside an Omeka instance

[feralresearch]

Per convo w/Jamie:

No we do not support associating a single Neatline exhibit with multiple Omeka sites.

Add a siteID to the adapter, default when not needed