[FEATURE] Disallow content elements in all containers #508
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A new method "Registry::addDisallowedCType" is added that allows excluding content elements from all
containers per default (if Ext:content_defender is installed).
However, content elements excluded in such a way can still be explicitly allowed via "allowed" setting in column configuration.
Note: The method needs to be called in ext_localconf.php, in order to work correctly, not in TCA.
Resolves: #507