Handle player ship destruction... some of it...

The player will be respawned, their lives decreased, and the board
cleared. The UI doesn't update, and the sudden snap to a freshly reset
board is quite jarring. The state transition to GameOver stops the game,
but there isn't anything else running in that state so it just looks
frozen.

Basically, there's a ton left to do, but technically I have handled
player ship destruction!

src/lib.rs

@@ -57,6 +57,7 @@ impl Plugin for AsteroidPlugin {
                 asteroids::spawn_asteroid.after(asteroids::tick_asteroid_manager),
                 asteroids::split_asteroids,
                 ship::bullet_impact_listener,
+                ship::ship_impact_listener,
                 collision_listener,
                 // TODO: Remove debug printing
                 debug_collision_event_printer,