Update to parity-scale-codec (#3232)

* WIP: update codec

* WIP

* compiling

* WIP

* rename parity-scale-codec to codec

* WIP

* fix

* remove old comments

* use published crates

* fix expected error msg

* bump version

* fmt and fix

* remove old comment

* fix wrong decoding impl

* implement encode like for structures

* undo removal of old pending changes

* trailingzeroinput

* Apply suggestions from code review

Co-Authored-By: Bastian Köcher <bkchr@users.noreply.github.com>
Co-Authored-By: DemiMarie-parity <48690212+DemiMarie-parity@users.noreply.github.com>

* update codec

* fmt

* version is 1.0.0

* show more error

* fmt

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

@@ -22,7 +22,7 @@ use std::{fmt, panic::UnwindSafe, result, marker::PhantomData};
 use std::borrow::Cow;
 use log::warn;
 use hash_db::Hasher;
-use parity_codec::{Decode, Encode};
+use codec::{Decode, Encode};
 use primitives::{
 	storage::well_known_keys, NativeOrEncoded, NeverNativeValue, offchain,
 };
@@ -938,7 +938,7 @@ pub(crate) fn set_changes_trie_config(
 ) -> Result<(), Box<dyn Error>> {
 	let config = match config {
 		Some(v) => Some(Decode::decode(&mut &v[..])
-			.ok_or_else(|| Box::new("Failed to decode changes trie configuration".to_owned()) as Box<dyn Error>)?),
+			.map_err(|_| Box::new("Failed to decode changes trie configuration".to_owned()) as Box<dyn Error>)?),
 		None => None,
 	};
 
@@ -972,7 +972,7 @@ where
 #[cfg(test)]
 mod tests {
 	use std::collections::HashMap;
-	use parity_codec::Encode;
+	use codec::Encode;
 	use overlayed_changes::OverlayedValue;
 	use super::*;
 	use super::backend::InMemory;