* Move srml-system RPC out.

* Fix tests for system-rpc module.

* Contracts RPC moved.

* Fix rpc test.

* Clean up.

* Update lockfile.

* Bump runtime version.

* Update srml/contracts/rpc/runtime-api/src/lib.rs

Co-Authored-By: Bastian Köcher <[email protected]>

* Bump impl version.