Countdown to first spawn in multiplayer

[SimonN]

Lix 0.10.0

At the start of a multiplayer match, show a visible countdown to your first spawned lix.

Without handicap, this would count down 4 seconds, but we might even increase that as a future physics change.

With spawn delay handicap, we must wait an extra 5 seconds to more than a minute. It's a long time, and it's nice to immediately focus fully when our first lix spawns. The countdown will help here.