Flatten back the structure (#837)

* Remove chains.

* Move relay clients.

* Flatten generic.

* Fix fmt.

bridges/relays/bin-substrate/src/main.rs

@@ -0,0 +1,41 @@
+// Copyright 2019-2020 Parity Technologies (UK) Ltd.
+// This file is part of Parity Bridges Common.
+
+// Parity Bridges Common is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Parity Bridges Common is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Parity Bridges Common.  If not, see <http://www.gnu.org/licenses/>.
+
+//! Substrate-to-substrate relay entrypoint.
+
+#![warn(missing_docs)]
+
+use relay_utils::initialize::initialize_relay;
+
+mod cli;
+mod finality_pipeline;
+mod finality_target;
+mod headers_initialize;
+mod messages_lane;
+mod messages_source;
+mod messages_target;
+
+mod rialto_millau;
+
+fn main() {
+	initialize_relay();
+	let command = cli::parse_args();
+	let run = command.run();
+	let result = async_std::task::block_on(run);
+	if let Err(error) = result {
+		log::error!(target: "bridge", "Failed to start relay: {}", error);
+	}
+}