v755 - Are you squirrelly enough?

- multiplayer: play as hungry squirrel! (finally!)
- multiplayer: spawn as squirrel on death
- multiplayer: sometimes spawn as squirrel instead of spectator on late network connection
- multiplayer client : meds active pickup audio replication fixed
- multiplayer client : game start audio replication fixed
- multiplayer client : game background music start fixed
- game cpu optimisations

Still working on multiplayer client hud objectives replication fix - soon!