Blocks should stop any interaction

According to the spec (https://www.w3.org/TR/activitypub/#block-activity-outbox), blocks should stop the blocked person from interaction with the blocker's objects. This means it should not be possible for a blocked person to like, announce or reply to a blocker's message.

This can't be enforced cross-server, but it should be followed locally. Any incoming activity that would be forbidden by this logic should be dropped .