WIP: Derive UUIDs of embedded AVMs from UUIDs of parent AVM and feature.
WIP: Derive UUIDs of embedded AVMs from UUIDs of parent AVM and feature.

- Make sure UUIDs of embedded AVMs are derived correctly when
  serializing AVMs to JSON (for the purpose of rendering them on the
  client-side).

itsjeyd/ODE,itsjeyd/ODE,itsjeyd/ODE,itsjeyd/ODE