Create generic distribution system

Still incredibly basic and only handles initial distribution and spawning with no relationships or anything.

src/game/plugin.rs

@@ -91,6 +91,8 @@ impl Plugin for GamePlugin {
             ),
         );
 
+        Seed::register(app);
+
         match self.source {
             DataSource::Address(peer) => {
                 info!("Will retrieve seed from peer => {peer}");