Remove unneeded Serde requirements (#1076)

* Remove superfluous serde requirements.

* Try to ensure hash is serde

* Fixups

* Building again

* Attempt to reenable Block (doesn't build)

* Fixes compilation for node cli

* Fixes test compilation

* Fix wasm

* Fix tests

* Remove unneeded changes

* Fix up comments

* Reenable some code

* Compile error when origin misused.

* Remove unnecessary includes of `serde_derive`

* Cleanups

substrate/srml/contract/Cargo.toml

@@ -5,7 +5,6 @@ authors = ["Parity Technologies <admin@parity.io>"]
 
 [dependencies]
 serde = { version = "1.0", default-features = false }
-serde_derive = { version = "1.0", optional = true }
 pwasm-utils = { version = "0.3", default-features = false }
 parity-codec = { version = "2.1", default-features = false }
 parity-codec-derive = { version = "2.1", default-features = false }
@@ -26,7 +25,6 @@ assert_matches = "1.1"
 [features]
 default = ["std"]
 std = [
-	"serde_derive",
 	"serde/std",
 	"parity-codec/std",
 	"parity-codec-derive/std",

substrate/srml/contract/src/lib.rs

@@ -52,10 +52,6 @@
 
 #![cfg_attr(not(feature = "std"), no_std)]
 
-#[cfg(feature = "std")]
-#[macro_use]
-extern crate serde_derive;
-
 #[macro_use]
 extern crate parity_codec_derive;