Implement support for renaming runtime api functions (#2160)

* Implement support for renaming runtime api functions

* Redelete the wasm files

* FIxes test

* Fix test correctly...

* Bring back old `authorities`

* Tag as deprecated

* Fixes compilation on WASM

* Add missing method implementations

* Fixes tests

* Increase `spec_version`

substrate/node/runtime/src/lib.rs

@@ -59,7 +59,7 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
 	spec_name: create_runtime_str!("node"),
 	impl_name: create_runtime_str!("substrate-node"),
 	authoring_version: 10,
-	spec_version: 55,
+	spec_version: 56,
 	impl_version: 56,
 	apis: RUNTIME_API_VERSIONS,
 };
@@ -251,6 +251,10 @@ impl_runtime_apis! {
 		fn initialize_block(header: &<Block as BlockT>::Header) {
 			Executive::initialize_block(header)
 		}
+
+		fn authorities() -> Vec<AuthorityIdFor<Block>> {
+			panic!("Deprecated, please use `AuthoritiesApi`.")
+		}
 	}
 
 	impl client_api::Metadata<Block> for Runtime {