More Extensible Multiaddress Format (#7380)

* More extensible multiaddress format

* update name

* Don't depend on indices to define multiaddress type

* Use MultiAddress in Node Template too!

* reduce traits, fix build

* support multiple `StaticLookup`

* bump tx version

* feedback

substrate/bin/node/runtime/src/lib.rs

@@ -111,7 +111,7 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
 	spec_version: 260,
 	impl_version: 0,
 	apis: RUNTIME_API_VERSIONS,
-	transaction_version: 1,
+	transaction_version: 2,
 };
 
 /// Native version.
@@ -931,7 +931,7 @@ construct_runtime!(
 );
 
 /// The address format for describing accounts.
-pub type Address = <Indices as StaticLookup>::Source;
+pub type Address = sp_runtime::MultiAddress<AccountId, AccountIndex>;
 /// Block header type as expected by this runtime.
 pub type Header = generic::Header<BlockNumber, BlakeTwo256>;
 /// Block type as expected by this runtime.