Extract smart-contract runtime into the separate crate (#179)

* Apply inversion of control to contract module.

* Extract contract to it's own crate.

* Rebuild binaries.

polkadot/runtime/wasm/Cargo.lock

@@ -548,6 +548,17 @@ dependencies = [
  "substrate-runtime-system 0.1.0",
 ]
 
+[[package]]
+name = "substrate-runtime-contract"
+version = "0.1.0"
+dependencies = [
+ "parity-wasm 0.30.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pwasm-utils 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "substrate-codec 0.1.0",
+ "substrate-runtime-sandbox 0.1.0",
+ "substrate-runtime-std 0.1.0",
+]
+
 [[package]]
 name = "substrate-runtime-council"
 version = "0.1.0"
@@ -667,14 +678,13 @@ name = "substrate-runtime-staking"
 version = "0.1.0"
 dependencies = [
  "hex-literal 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "parity-wasm 0.30.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "pwasm-utils 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "safe-mix 0.1.0",
  "serde 1.0.27 (registry+https://github.com/rust-lang/crates.io-index)",
  "substrate-codec 0.1.0",
  "substrate-keyring 0.1.0",
  "substrate-primitives 0.1.0",
  "substrate-runtime-consensus 0.1.0",
+ "substrate-runtime-contract 0.1.0",
  "substrate-runtime-io 0.1.0",
  "substrate-runtime-primitives 0.1.0",
  "substrate-runtime-sandbox 0.1.0",