Separate NXT import and export switches

For GiveCampus integrations and API.

The Blackbaud settings distinguish basic constituent import, gift-history import, gift export and event export. An enabled connection or constituent import is not proof that gift export is on. Schools can review event-export settings separately from the gift-export switch, subject to entitlement and mapping readiness. Before enabling Events, confirm its constituent/fund setup and sample registration export. To verify an import, inspect its actual run/status and known constituent records rather than relying on the connected badge alone.