Update rust edition to 2021 (#749)

* build: update rust edition 2021

* cargo: format all

* build: fix tests and warnings

controller/Cargo.toml

@@ -8,7 +8,7 @@ repository = "https://github.com/mimblewimble/grin-wallet"
 keywords = [ "crypto", "grin", "mimblewimble" ]
 exclude = ["**/*.grin", "**/*.grin2"]
 #build = "src/build/build.rs"
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 futures = "0.3"

controller/src/command.rs

@@ -82,7 +82,7 @@ where
 	C: NodeClient + 'static,
 	K: keychain::Keychain + 'static,
 {
-// Assume global chain type has already been initialized.
+	// Assume global chain type has already been initialized.
 	let chain_type = global::get_chain_type();
 
 	let mut w_lock = owner_api.wallet_inst.lock();

controller/tests/common/mod.rs

@@ -96,8 +96,12 @@ pub fn setup_global_chain_type() {
 
 pub fn create_wallet_proxy(
 	test_dir: &str,
-) -> WalletProxy<DefaultLCProvider<LocalWalletClient, ExtKeychain>, LocalWalletClient, ExtKeychain>
-{
+) -> WalletProxy<
+	'_,
+	DefaultLCProvider<'_, LocalWalletClient, ExtKeychain>,
+	LocalWalletClient,
+	ExtKeychain,
+> {
 	WalletProxy::new(test_dir)
 }