Further networking work

- Physics now handles PositionLook and SpawnPosition (to update Player
position)
- Interface now handles PositionLook (to update camera of look from server)
- Network now uses the new AnnotatedMessageHandler
- All components that have concurrent queues from the networking now
  remove their own messages from their respective queues. Since each
  component has their own reference to the message, it is safe to do so
  (and we no longer need to check read status).
- Add a bunch of TODOs for @DDoS

Signed-off-by: Chris Sanders <zidane@outlook.com>