Merge branch 'master' into contracts

Bring the contracts feature branch up to current master, which has since
landed rust 1.80 support (#722), the canonical mwixnet onion code (#726),
and node-client proxy support (#738).

Conflict resolution:
- libwallet/src/mwixnet/*: take master's (#726), dropping the contracts
  branch's older divergent copy. owner.rs::create_mwixnet_req updated to
  master's API (use_test_rng) and master's flat re-export imports.
- Cargo manifests/lock/.cargo: master's deps & version; re-add serde_with
  for Slate v5; keep contracts' .cargo/config.toml (Windows static-CRT).
- lib.rs: keep serde_derive AND serde_with macro_use; single mwixnet decl.
- error.rs: union of master + contracts variants; flat mwixnet re-exports.
- api/libwallet owner.rs: master's #738 + create_mwixnet_req plus the
  contract_* entry points; drop duplicate older create_mwixnet_req method.
- slatepack/armor.rs, node_clients/resp_types.rs: take master's.

Workspace builds; libwallet lib tests pass (34/34). The Slate version()
bug, issue #729 fix, and de-panicking follow in subsequent commits.

impls/src/adapters/http.rs

@@ -204,9 +204,10 @@ impl HttpSlateSender {
 		let client = if !self.use_socks {
 			Client::new()
 		} else {
-			Client::with_socks_proxy(
+			Client::with_proxy(
 				self.socks_proxy_addr
 					.ok_or_else(|| ClientError::Internal("No socks proxy address set".into()))?,
+				"socks5h://",
 			)
 		}
 		.map_err(|_| ClientError::Internal("Unable to create http client".into()))?;

impls/src/client_utils/client.rs

@@ -65,11 +65,11 @@ impl Client {
 		Self::build(None)
 	}
 
-	pub fn with_socks_proxy(socks_proxy_addr: SocketAddr) -> Result<Self, Error> {
-		Self::build(Some(socks_proxy_addr))
+	pub fn with_proxy(socks_proxy_addr: SocketAddr, scheme: &'static str) -> Result<Self, Error> {
+		Self::build(Some((socks_proxy_addr, scheme)))
 	}
 
-	fn build(socks_proxy_addr: Option<SocketAddr>) -> Result<Self, Error> {
+	fn build(proxy: Option<(SocketAddr, &str)>) -> Result<Self, Error> {
 		let mut headers = HeaderMap::new();
 		headers.insert(USER_AGENT, HeaderValue::from_static("grin-client"));
 		headers.insert(ACCEPT, HeaderValue::from_static("application/json"));
@@ -80,8 +80,9 @@ impl Client {
 			.use_rustls_tls()
 			.default_headers(headers);
 
-		if let Some(s) = socks_proxy_addr {
-			let proxy = Proxy::all(&format!("socks5h://{}:{}", s.ip(), s.port()))
+		if let Some(p) = proxy {
+			let (addr, scheme) = p;
+			let proxy = Proxy::all(&format!("{}{}:{}", scheme, addr.ip(), addr.port()))
 				.map_err(|e| Error::Internal(format!("Unable to create proxy: {}", e)))?;
 			builder = builder.proxy(proxy);
 		}

impls/src/node_clients/http.rs

@@ -15,17 +15,17 @@
 //! Client functions, implementations of the NodeClient trait
 
 use crate::api::{self, LocatedTxKernel, OutputListing, OutputPrintable};
+use crate::client_utils::{Client, RUNTIME};
 use crate::core::core::{Transaction, TxKernel};
+use crate::libwallet;
 use crate::libwallet::{NodeClient, NodeVersionInfo};
+use crate::util::secp::pedersen;
+use crate::util::ToHex;
 use futures::stream::FuturesUnordered;
 use futures::TryStreamExt;
 use std::collections::HashMap;
 use std::env;
-
-use crate::client_utils::{Client, RUNTIME};
-use crate::libwallet;
-use crate::util::secp::pedersen;
-use crate::util::ToHex;
+use std::net::SocketAddr;
 
 use super::resp_types::*;
 use crate::client_utils::json_rpc::*;
@@ -46,8 +46,22 @@ impl HTTPNodeClient {
 		node_url: &str,
 		node_api_secret: Option<String>,
 	) -> Result<HTTPNodeClient, libwallet::Error> {
+		Self::new_proxy(node_url, node_api_secret, None)
+	}
+
+	/// Create a new client with proxy
+	pub fn new_proxy(
+		node_url: &str,
+		node_api_secret: Option<String>,
+		proxy: Option<(SocketAddr, &'static str)>,
+	) -> Result<HTTPNodeClient, libwallet::Error> {
+		let client = if let Some((a, s)) = proxy {
+			Client::with_proxy(a, s)
+		} else {
+			Client::new()
+		};
 		Ok(HTTPNodeClient {
-			client: Client::new().map_err(|_| libwallet::Error::Node)?,
+			client: client.map_err(|_| libwallet::Error::Node)?,
 			node_url: node_url.to_owned(),
 			node_api_secret: node_api_secret,
 			node_version_info: None,

impls/src/node_clients/resp_types.rs

@@ -14,6 +14,7 @@
 // Derived from https://github.com/apoelstra/rust-jsonrpc
 
 //! JSON RPC Types for V2 node client
+
 #[allow(dead_code)]
 #[derive(Debug, Deserialize)]
 pub struct GetTipResp {