Feature Request: Partial Import

[Progression]

Be able import JSON for new connectors etc with out wiping out all the previous ones.

The reason being that in developing news parts of a site on development machine, which has a different database to the a beta or live server, requires adding all the new field groups and connectors manually as the base definitions on these beta/live databases may not be the same as the development db.

I think it would be acceptable to only allow the import of new definitions, so no need to try and update or merge existing definitions. People can then manual delete existing definitions before they try and re-import them again.