Switch to shiny new fast, RLP-less trie (#795)

* Bump codec

* Fix tests

* Patricia trie builds

* Introduce trie

* Some yak shaving.

* Some fixes

* Remove RLP ref

* Fixes

* It builds!

* Some tests fixed

* Another test fix

* Rejig more hashes

* substrate-trie::iterator_works test

* Update lock

* Polish

* Docs

* Undo incorrect "fix" for tests

* Fix nits

substrate/core/primitives/src/lib.rs

@@ -35,8 +35,6 @@ extern crate parity_codec_derive;
 extern crate rustc_hex;
 extern crate byteorder;
 extern crate parity_codec as codec;
-#[cfg(feature = "std")]
-extern crate rlp;
 
 #[cfg(feature = "std")]
 extern crate serde;
@@ -62,10 +60,8 @@ extern crate serde_derive;
 extern crate core;
 #[cfg(feature = "std")]
 extern crate wasmi;
-extern crate hashdb;
-extern crate plain_hasher;
-#[cfg(feature = "std")]
-extern crate patricia_trie;
+extern crate hash_db;
+extern crate hash256_std_hasher;
 #[cfg(feature = "std")]
 extern crate elastic_array;
 
@@ -110,8 +106,6 @@ pub mod sandbox;
 pub mod storage;
 pub mod uint;
 mod authority_id;
-#[cfg(feature = "std")]
-mod rlp_codec;
 mod changes_trie;
 
 #[cfg(test)]
@@ -126,9 +120,6 @@ pub use changes_trie::ChangesTrieConfiguration;
 // pub use self::hasher::blake::BlakeHasher;
 pub use self::hasher::blake2::Blake2Hasher;
 
-#[cfg(feature = "std")]
-pub use self::rlp_codec::RlpCodec;
-
 /// A 512-bit value interpreted as a signature.
 pub type Signature = hash::H512;