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/client/executor/src/wasm_runtime.rs

@@ -223,8 +223,9 @@ fn create_versioned_wasm_runtime<E: Externalities>(
 		// The following unwind safety assertion is OK because if the method call panics, the
 		// runtime will be dropped.
 		let mut runtime = AssertUnwindSafe(runtime.as_mut());
-		crate::native_executor::safe_call(
-			move || runtime.call(&mut **ext, "Core_version", &[])
+		crate::native_executor::with_externalities_safe(
+			&mut **ext,
+			move || runtime.call("Core_version", &[])
 		).map_err(|_| WasmError::Instantiation("panic in call to get runtime version".into()))?
 	};
 	let encoded_version = version_result