Implement runtime version checks in set_code (#4548)

* Implement runtime version checks in `set_code`

Check that the new runtime code given to `set_code` fullfills some
requirements:

- `spec_name` matches
- `spec_version` does not decreases
- `impl_version` does not decreases
- Either `spec_version` and `impl_version` increase

* Make tests almost work

* Some fixes after master merge

* Fix tests

* Add missed file

* Make depedency check happy?

* Remove leftover `sc-executor`

* AHHHHH

* Reset debug stuff

* Remove some 'static

* More 'static

* Some docs

* Update `Cargo.lock`

substrate/test-utils/client/src/client_ext.rs

@@ -64,7 +64,7 @@ pub trait ClientBlockImportExt<Block: BlockT>: Sized {
 impl<B, E, RA, Block> ClientExt<Block> for Client<B, E, Block, RA>
 	where
 		B: sc_client_api::backend::Backend<Block>,
-		E: sc_client::CallExecutor<Block>,
+		E: sc_client::CallExecutor<Block> + 'static,
 		Self: BlockImport<Block, Error = ConsensusError>,
 		Block: BlockT,
 {