Add support for funkwhale Audio activity

reel2bits fixture not included as it lacks the Actor fixture for it.

Closes: https://git.pleroma.social/pleroma/pleroma/issues/1624
Closes: https://git.pleroma.social/pleroma/pleroma/issues/764

lib/pleroma/web/mastodon_api/views/status_view.ex

@@ -421,7 +421,7 @@ defmodule Pleroma.Web.MastodonAPI.StatusView do
   end
 
   def render_content(%{data: %{"type" => object_type}} = object)
-      when object_type in ["Video", "Event"] do
+      when object_type in ["Video", "Event", "Audio"] do
     with name when not is_nil(name) and name != "" <- object.data["name"] do
       "<p><a href=\"#{object.data["id"]}\">#{name}</a></p>#{object.data["content"]}"
     else