Update hex-literal version, simplify imports and remove unused dependencies (#2371)

substrate/core/state-machine/src/basic.rs

@@ -166,7 +166,7 @@ impl<H: Hasher> Externalities<H> for BasicExternalities where H::Out: Ord + Heap
 mod tests {
 	use super::*;
 	use primitives::{Blake2Hasher, H256};
-	use hex_literal::{hex, hex_impl};
+	use hex_literal::hex;
 
 	#[test]
 	fn commit_should_work() {

substrate/core/state-machine/src/ext.rs

@@ -360,7 +360,7 @@ where
 
 #[cfg(test)]
 mod tests {
-	use hex_literal::{hex, hex_impl};
+	use hex_literal::hex;
 	use parity_codec::Encode;
 	use primitives::{Blake2Hasher};
 	use primitives::storage::well_known_keys::EXTRINSIC_INDEX;

substrate/core/state-machine/src/overlayed_changes.rs

@@ -309,7 +309,7 @@ impl From<Option<Vec<u8>>> for OverlayedValue {
 
 #[cfg(test)]
 mod tests {
-	use hex_literal::{hex, hex_impl};
+	use hex_literal::hex;
 	use primitives::{Blake2Hasher, H256};
 	use primitives::storage::well_known_keys::EXTRINSIC_INDEX;
 	use crate::backend::InMemory;

substrate/core/state-machine/src/testing.rs

@@ -180,7 +180,7 @@ impl<H: Hasher> Externalities<H> for TestExternalities<H> where H::Out: Ord + He
 mod tests {
 	use super::*;
 	use primitives::{Blake2Hasher, H256};
-	use hex_literal::{hex, hex_impl};
+	use hex_literal::hex;
 
 	#[test]
 	fn commit_should_work() {