Switch to single bevy dep with no default features (#33)

Impossible to use a patched bevy 0.5 version alongside a dep that
depends on bevy sub crates (bevy_ecs, bevy_app, etc).

Doing so gives: error[E0277]: the trait bound `NetworkingPlugin: bevy::prelude::Plugin` is not satisfied

See: https://github.com/bevyengine/bevy/blob/main/docs/plugins_guidelines.md#bevy-features

Guidelines from bevy now to use `bevy` without default features in this
case.

Discord link to start of conversation:
https://discord.com/channels/691052431525675048/691052431974465548/860423772979593246

Cargo.toml

@@ -27,10 +27,7 @@ use-webrtc = [
 ]
 
 [dependencies]
-bevy_app = "0.5"
-bevy_core = "0.5"
-bevy_ecs = "0.5"
-bevy_tasks = "0.5"
+bevy = {version = "0.5", default-features = false}
 turbulence = "0.3"
 naia-client-socket = { version = "0.6", features = ["multithread"] }
 bytes = "1.0"

src/channels.rs

@@ -1,6 +1,6 @@
 #![allow(unused)]
 
-use bevy_tasks::{Task, TaskPool};
+use bevy::tasks::{Task, TaskPool};
 use futures::{stream, Stream};
 use futures_timer::Delay;
 use std::{

src/lib.rs

@@ -1,7 +1,9 @@
-use bevy_app::{AppBuilder, Events, Plugin, CoreStage};
-use bevy_ecs::prelude::*;
-use bevy_tasks::{IoTaskPool, TaskPool};
-use bevy_core::{FixedTimestep};
+use bevy::{
+    app::{AppBuilder, Events, Plugin, CoreStage},
+    ecs::prelude::*,
+    tasks::{IoTaskPool, TaskPool, Task},
+    core::FixedTimestep,
+};
 
 #[cfg(not(target_arch = "wasm32"))]
 use crossbeam_channel::{unbounded, Receiver, Sender, SendError as CrossbeamSendError};
@@ -120,7 +122,7 @@ pub struct NetworkResource {
 #[cfg(not(target_arch = "wasm32"))]
 #[allow(dead_code)] // FIXME: remove this struct?
 struct ServerListener {
-    receiver_task: bevy_tasks::Task<()>,
+    receiver_task: Task<()>,
     // needed to keep receiver_task alive
     sender: ServerSender,
     socket_address: SocketAddr,

src/transport.rs

@@ -1,6 +1,6 @@
 #[cfg(not(target_arch = "wasm32"))]
-use bevy_tasks::Task;
-use bevy_tasks::TaskPool;
+use bevy::tasks::Task;
+use bevy::tasks::TaskPool;
 use bytes::Bytes;
 use std::{error::Error, net::SocketAddr, sync::{Arc, RwLock}};
 use instant::{Instant, Duration};