Expose instancing in metadata (#3188)

* Expose instancing in metadata

- Introduces metadata v7
- If a module is using instancing, the storage exposes the instance in
metadata
- Metadata module name is now the upper case one given to
`construct_runtime!`

* Remove obsolete macro

* Just expose one prefix

* Bump spec

* Fix prefix generation

substrate/node/runtime/src/lib.rs

@@ -75,8 +75,8 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
 	// and set impl_version to equal spec_version. If only runtime
 	// implementation changes and behavior does not, then leave spec_version as
 	// is and increment impl_version.
-	spec_version: 118,
-	impl_version: 118,
+	spec_version: 119,
+	impl_version: 119,
 	apis: RUNTIME_API_VERSIONS,
 };