Rework networking interface

Add Bevy event queues for inbound and outbound packets, and use Bevy change detection for consumer new Peer handling.

src/net/mod.rs

@@ -1,5 +1,13 @@
+mod io;
+mod peer;
 mod plugin;
-pub use plugin::NetIOPlugin;
 mod queues;
 mod socket;
 mod thread;
+
+#[allow(unused_imports)]
+pub mod prelude {
+    pub use super::io::{InboundPacket, OutboundPacket, Packet};
+    pub use super::peer::Peer;
+    pub use super::plugin::{NetIOPlugin, NetworkState};
+}