Add bio fields (#6645)

* Add bio fields

- Fix #3211
- Fix #232
- Fix #121

* Display bio fields in web UI

* Fix output of links and missing fields

* Federate bio fields over ActivityPub as PropertyValue

* Improve how the fields are stored, add to Edit profile form

* Add rel=me to links in fields

Fix #121

app/serializers/activitypub/actor_serializer.rb

@@ -11,6 +11,7 @@ class ActivityPub::ActorSerializer < ActiveModel::Serializer
   has_one :public_key, serializer: ActivityPub::PublicKeySerializer
 
   has_many :virtual_tags, key: :tag
+  has_many :virtual_attachments, key: :attachment
 
   attribute :moved_to, if: :moved?
 
@@ -107,10 +108,26 @@ class ActivityPub::ActorSerializer < ActiveModel::Serializer
     object.emojis
   end
 
+  def virtual_attachments
+    object.fields
+  end
+
   def moved_to
     ActivityPub::TagManager.instance.uri_for(object.moved_to_account)
   end
 
   class CustomEmojiSerializer < ActivityPub::EmojiSerializer
   end
+
+  class Account::FieldSerializer < ActiveModel::Serializer
+    attributes :type, :name, :value
+
+    def type
+      'PropertyValue'
+    end
+
+    def value
+      Formatter.instance.format_field(object.account, object.value)
+    end
+  end
 end