Implement blocks (#554)

* Quick fix to prompt

* Add blocked accounts screen

* Add blocking tools to profile

* Blur avis/banners of blocked users

* Factor blocking state into moderation dsl

* Filter post slices from the feed if any are hidden

* Handle various block UIs

* Filter in the client on blockedBy

* Implement block list

* Fix some copy

* Bump deps

* Fix lint

src/state/models/feeds/notifications.ts

@@ -111,6 +111,10 @@ export class NotificationsFeedItemModel {
         addedInfo?.profileLabels || [],
       ),
       isMuted: this.author.viewer?.muted || addedInfo?.isMuted || false,
+      isBlocking:
+        !!this.author.viewer?.blocking || addedInfo?.isBlocking || false,
+      isBlockedBy:
+        !!this.author.viewer?.blockedBy || addedInfo?.isBlockedBy || false,
     }
   }