Exclude some backend layouts from being resolved during recursive solving

When using recursive resolving child elements all children are resolved until the specified depth is reached. This is fine in most cases, but if you have some media attached to your elements, the media will not be resolved on child elements. This is fine too, but sometimes annoying because you cannot stop the resolving of gridelements.

Therefore it would be nice to have an option in the options-array of the GridChildrenProcessor, which excludes specific backend-layouts from being handled by the recursive resolver. That would enable the handling as new content element and the above problem would be solved.