WASM contracts MVP (#5679)

* lifetime issues

* refactor to new 'native env'

* descriptors and such

* wasm mvp continued

* finalized env/ext bindings

* descriptor -> call_args

* inject gas counter

* result processing and engine activation

* tabify some source files

* needs return new

* wasm tests initial

* erradicate warnings

* origin in the descriptor

* update test repo

* payload verification tests

* identity return payload test

* some test description

* dispersion test

* check length here

* suicidal contract

* engine params

* fix typo

* review fixes

* submodule update

* update - purge reserved space

* doc effort

* more review fixes

* fix error message

* fix dependency url

* reorg error handling

* update submodule

* update utils

* update to latest parity-wasm

* tabify

* fix wasm magic header

* update dependencies

* external create and tests

* update to latest tests

* extra trace info

* Update parity-wasm

* update wasm-utils also

* few traces and result handle change

* alter trace content

* fix issues with optimizer, update to latest parity with validator, etc

* static initialization

* license preamble

* update wasm crates and gas costs

* fix grumbles

* bring back lifetime

* fix compilation

ethcore/src/spec/spec.rs

@@ -80,9 +80,11 @@ pub struct CommonParams {
 	/// Number of first block where dust cleanup rules (EIP-168 and EIP169) begin.
 	pub dust_protection_transition: BlockNumber,
 	/// Nonce cap increase per block. Nonce cap is only checked if dust protection is enabled.
-	pub nonce_cap_increment : u64,
+	pub nonce_cap_increment: u64,
 	/// Enable dust cleanup for contracts.
-	pub remove_dust_contracts : bool,
+	pub remove_dust_contracts: bool,
+	/// Wasm support
+	pub wasm: bool,
 }
 
 impl From<ethjson::spec::Params> for CommonParams {
@@ -110,6 +112,7 @@ impl From<ethjson::spec::Params> for CommonParams {
 			dust_protection_transition: p.dust_protection_transition.map_or(BlockNumber::max_value(), Into::into),
 			nonce_cap_increment: p.nonce_cap_increment.map_or(64, Into::into),
 			remove_dust_contracts: p.remove_dust_contracts.unwrap_or(false),
+			wasm: p.wasm.unwrap_or(false),
 		}
 	}
 }