Create generic distribution system

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

src/net/distribution.rs

@@ -0,0 +1,49 @@
+use bevy::prelude::*;
+
+use super::{
+    packet::{InboundPacket, OutboundPacket, Packet},
+    peer::Peer,
+    state::NetworkState,
+};
+
+fn spawner<T: TryFrom<Vec<u8>> + Component>(
+    mut inbound: EventReader<InboundPacket>,
+    mut commands: Commands,
+) {
+    for packet in inbound.read() {
+        if let Ok(entity) = T::try_from(packet.0.message.clone()) {
+            commands.spawn(entity);
+        }
+    }
+}
+
+fn sender<T: Into<Vec<u8>> + Component + Clone>(
+    peers: Query<&Peer, Added<Peer>>,
+    entities: Query<&T>,
+    mut outbound: EventWriter<OutboundPacket>,
+) {
+    for peer in peers {
+        for entity in entities {
+            outbound.write(OutboundPacket(Packet::new(
+                (*entity).clone().into(),
+                peer.uuid,
+            )));
+        }
+    }
+}
+
+pub trait Networked: Into<Vec<u8>> + TryFrom<Vec<u8>> + Component + Clone {
+    fn register(app: &mut App);
+}
+
+impl<T> Networked for T
+where
+    T: Into<Vec<u8>> + TryFrom<Vec<u8>> + Component + Clone,
+{
+    fn register(app: &mut App) {
+        app.add_systems(
+            FixedUpdate,
+            (sender::<T>, spawner::<T>).run_if(in_state(NetworkState::MultiPlayer)),
+        );
+    }
+}