Light friendly dapps (#5634)

* move native_contracts ABIs to JSON files, add urlhint

* port hash-fetch to futures, fix tests

* fix dapps compilation, defer async port to later

* activate dapps server in the light client

* better formatting

ethcore/native_contracts/src/lib.rs

@@ -24,6 +24,7 @@ extern crate ethabi;
 extern crate ethcore_util as util;
 
 mod registry;
+mod urlhint;
 mod service_transaction;
 mod secretstore_acl_storage;
 mod validator_set;
@@ -32,6 +33,7 @@ mod validator_report;
 pub mod test_contracts;
 
 pub use self::registry::Registry;
+pub use self::urlhint::Urlhint;
 pub use self::service_transaction::ServiceTransactionChecker;
 pub use self::secretstore_acl_storage::SecretStoreAclStorage;
 pub use self::validator_set::ValidatorSet;

ethcore/native_contracts/src/urlhint.rs

@@ -0,0 +1,22 @@
+// Copyright 2015-2017 Parity Technologies (UK) Ltd.
+// This file is part of Parity.
+
+// Parity 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.
+
+// Parity 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 Parity.  If not, see <http://www.gnu.org/licenses/>.
+
+#![allow(unused_mut, unused_variables, unused_imports)]
+
+//! Registrar contract: maps names to arbitrary URL.
+// TODO: testing.
+
+include!(concat!(env!("OUT_DIR"), "/urlhint.rs"));