allow creating bidirectional connections #790
Description
Is your feature request related to a problem? Please describe.
bidirectional connections between tables are often a desired feature but as far as I see there is no option to configure it in the ExtensionBuilder UI.
Describe the solution you'd like
It would be useful being able to configure bidirectional relations in the ExtensionBuilder UI and also reduce the created tables (even if mm tables never show up in SQL and TCA usually beyond their reference as mm-table).