Proof of concept: Add a new runtime that uses pallet_contracts (#186)

* seal: Copy over a legacy version of pallet_contracts from substrate

* seal: Fix substrate dependency pathes and add as dependency to runtime

* seal: Adapt pallet to current substrate version

* seal: Add contracts pallet to runtime

* seal: Implement rpc runtime api

* seal: Update to latest rpc output format

* seal: Replace child trie by prefix trie

* seal: Add contracts endpoint to the client

* seal: fixup rpc test

* Fix whitespace issue

Co-authored-by: Sergei Shulepov <sergei@parity.io>

* seal: Move pallet out of the runtime directory

* seal: Create a seperate runtime for contracts

* Move parachains to top level directory

* seal: Disable rent for easier testing

Co-authored-by: Sergei Shulepov <sergei@parity.io>

cumulus/rococo-parachains/build.rs

@@ -0,0 +1,22 @@
+// Copyright 2019 Parity Technologies (UK) Ltd.
+// This file is part of Cumulus.
+
+// Substrate is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Substrate is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Cumulus.  If not, see <http://www.gnu.org/licenses/>.
+
+use substrate_build_script_utils::{generate_cargo_keys, rerun_if_git_head_changed};
+
+fn main() {
+	generate_cargo_keys();
+	rerun_if_git_head_changed();
+}