Decouple virtual machines (#6184)

* work in progress for splitting vms

* evm working

* Evm -> Vm

* wasm converted

* ethcore working

* test fixes

ethcore/light/src/lib.rs

@@ -80,6 +80,7 @@ extern crate serde;
 extern crate smallvec;
 extern crate stats;
 extern crate time;
+extern crate vm;
 
 #[cfg(feature = "ipc")]
 extern crate ethcore_ipc as ipc;

ethcore/light/src/on_demand/request.rs

@@ -24,7 +24,7 @@ use ethcore::engines::Engine;
 use ethcore::receipt::Receipt;
 use ethcore::state::{self, ProvedExecution};
 use ethcore::transaction::SignedTransaction;
-use evm::env_info::EnvInfo;
+use vm::EnvInfo;
 
 use request::{self as net_request, IncompleteRequest, CompleteRequest, Output, OutputKind, Field};