Merge branch 'feature/create-tombstone-instead-of-delete' into 'develop'

Create tombstone instead of object deletion

See merge request pleroma/pleroma!593

test/web/activity_pub/activity_pub_test.exs

@@ -492,7 +492,7 @@ defmodule Pleroma.Web.ActivityPub.ActivityPubTest do
 
       assert Repo.get(Activity, delete.id) != nil
 
-      assert Repo.get(Object, object.id) == nil
+      assert Repo.get(Object, object.id).data["type"] == "Tombstone"
     end
   end