Replace failure with thiserror (#654)

* updated util and libwallet with thiserror

* update impl crate to thiserror

* api crate converted to thiserror

* update of controller crate to thiserror

* update final bin + tests to thiserror

* update unused import

* remove failure derive

* reset import of grin to master

* update cargo lock

* update from master

util/Cargo.toml

@@ -16,6 +16,7 @@ serde_derive = "1"
 ed25519-dalek = "1.0.0-pre.4"
 data-encoding = "2"
 sha3 = "0.8"
+thiserror = "1"
 
 # For Release
 #grin_core = "4.0.0"

util/src/ov3.rs

@@ -20,12 +20,14 @@ use sha3::{Digest, Sha3_256};
 use std::convert::TryFrom;
 use std::fmt;
 
-#[derive(Debug, Clone, Eq, PartialEq, Serialize, Deserialize)]
+#[derive(Debug, Clone, Eq, PartialEq, thiserror::Error, Serialize, Deserialize)]
 /// OnionV3 Address Errors
 pub enum OnionV3Error {
 	/// Error decoding an address from a string
+	#[error("Address Decoding: {0}")]
 	AddressDecoding(String),
 	/// Error with given private key
+	#[error("Invalid Private Key: {0}")]
 	InvalidPrivateKey(String),
 }