[WIP] Enable custom emoji on account pages and in the sidebar (#6124)

Federate custom emojis with accounts

app/models/remote_profile.rb

@@ -41,6 +41,10 @@ class RemoteProfile
     @header ||= link_href_from_xml(author, 'header')
   end
 
+  def emojis
+    @emojis ||= author.xpath('./xmlns:link[@rel="emoji"]', xmlns: OStatus::TagManager::XMLNS)
+  end
+
   def locked?
     scope == 'private'
   end