More dependency cleanup (#825)

* Removes `rlp` dependency

* Enable warnings about unused crates in the CI

* Remove all the unused crates

* Make tests working again

substrate/core/executor/Cargo.toml

@@ -16,12 +16,9 @@ serde = "1.0"
 serde_derive = "1.0"
 wasmi = "0.4"
 byteorder = "1.1"
-trie-root = { git = "https://github.com/paritytech/trie" }
-twox-hash = "1.1.0"
 lazy_static = "1.0"
 parking_lot = "*"
 log = "0.4"
-hash-db = { git = "https://github.com/paritytech/trie" }
 
 [dev-dependencies]
 assert_matches = "1.1"

substrate/core/executor/src/lib.rs

@@ -38,13 +38,9 @@ extern crate substrate_state_machine as state_machine;
 extern crate sr_version as runtime_version;
 extern crate substrate_trie as trie;
 
-extern crate serde;
 extern crate wasmi;
 extern crate byteorder;
-extern crate trie_root;
 extern crate parking_lot;
-extern crate twox_hash;
-extern crate hash_db;
 
 #[macro_use]
 extern crate log;

substrate/core/executor/wasm/Cargo.lock

@@ -130,7 +130,6 @@ version = "0.1.0"
 dependencies = [
  "parity-codec 2.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "sr-io 0.1.0",
  "sr-std 0.1.0",
  "substrate-primitives 0.1.0",
 ]