Upgrade from futures-preview to futures 0.3.1, and remove futures 0.1 where currently possible (#4083)

* Migrate node and node-template

* Migrate srml

* Simple changes

* Add async-std for interval

* Fix test-runtime warning

* Small changes

* move futures01 in core/rpc to dev-deps

* Change wasm CI builds

* Switch to async-std 1.0.1

* Remove async-std dep of network

* Add modified lockfile

* Fix node cli browser build

* Remove authority-discovery async-std dep

* Add Send + Sync to interval dyn stream

substrate/client/rpc/src/system/mod.rs

@@ -19,7 +19,7 @@
 #[cfg(test)]
 mod tests;
 
-use futures03::{channel::{mpsc, oneshot}, compat::Compat};
+use futures::{channel::{mpsc, oneshot}, compat::Compat};
 use api::Receiver;
 use sr_primitives::traits::{self, Header as HeaderT};
 use self::error::Result;

substrate/client/rpc/src/system/tests.rs

@@ -20,7 +20,7 @@ use network::{self, PeerId};
 use network::config::Roles;
 use test_client::runtime::Block;
 use assert_matches::assert_matches;
-use futures03::{prelude::*, channel::mpsc};
+use futures::{prelude::*, channel::mpsc};
 use std::thread;
 
 struct Status {
@@ -46,7 +46,7 @@ fn api<T: Into<Option<Status>>>(sync: T) -> System<Block> {
 	let should_have_peers = !status.is_dev;
 	let (tx, rx) = mpsc::unbounded();
 	thread::spawn(move || {
-		futures03::executor::block_on(rx.for_each(move |request| {
+		futures::executor::block_on(rx.for_each(move |request| {
 			match request {
 				Request::Health(sender) => {
 					let _ = sender.send(Health {
@@ -231,4 +231,4 @@ fn system_node_roles() {
 		wait_receiver(api(None).system_node_roles()),
 		vec![NodeRole::Authority]
 	);
-}
+}