Decouple virtual machines (#6184)

* work in progress for splitting vms

* evm working

* Evm -> Vm

* wasm converted

* ethcore working

* test fixes

ethcore/src/trace/mod.rs

@@ -39,7 +39,7 @@ pub use self::types::filter::{Filter, AddressesFilter};
 
 use util::{Bytes, Address, U256, H256, DBTransaction};
 use self::trace::{Call, Create};
-use evm::action_params::ActionParams;
+use vm::ActionParams;
 use header::BlockNumber;
 
 /// This trait is used by executive to build traces.