Make relay CLI generic (#849)

* Start generalizing rialto-millau commands.

* cargo fmt --all

* Introduce generic balance.

* Unify message payloads.

* cargo fmt --all

* init - generic

* Attempt to unify send message.

* Start moving things around.

* cargo fmt --all

* Move init-bridge.

* cargo fmt --all

* Improve UX of bridge argument.

* Fix clippy.

* Fix docs and scripts.

* Add docs.

* Apply suggestions from code review

Co-authored-by: Hernando Castano <HCastano@users.noreply.github.com>

* Fix copyright.

* Add issue numbers.

* More todos.

* Update comments.

Co-authored-by: Hernando Castano <HCastano@users.noreply.github.com>

bridges/primitives/chain-westend/Cargo.toml

@@ -16,6 +16,7 @@ bp-runtime = { path = "../runtime", default-features = false }
 # Substrate Based Dependencies
 sp-api = { git = "https://github.com/paritytech/substrate", branch = "master" , default-features = false }
 sp-std = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
+sp-version = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 
 [features]
 default = ["std"]
@@ -25,4 +26,5 @@ std = [
 	"bp-runtime/std",
 	"sp-api/std",
 	"sp-std/std",
+	"sp-version/std",
 ]

bridges/primitives/chain-westend/src/lib.rs

@@ -22,12 +22,24 @@
 
 use bp_messages::{LaneId, MessageNonce, UnrewardedRelayersState, Weight};
 use sp_std::prelude::*;
+use sp_version::RuntimeVersion;
 
 pub use bp_polkadot_core::*;
 
 /// Westend Chain
 pub type Westend = PolkadotLike;
 
+/// Runtime version.
+pub const VERSION: RuntimeVersion = RuntimeVersion {
+	spec_name: sp_version::create_runtime_str!("westend"),
+	impl_name: sp_version::create_runtime_str!("parity-westend"),
+	authoring_version: 2,
+	spec_version: 50,
+	impl_version: 0,
+	apis: sp_version::create_apis_vec![[]],
+	transaction_version: 5,
+};
+
 // We use this to get the account on Westend (target) which is derived from Rococo's (source)
 // account.
 pub fn derive_account_from_rococo_id(id: bp_runtime::SourceAccount<AccountId>) -> AccountId {