Allow single opcode stepping for EVM (#9051)

* Feed in ActionParams on VM creation

* Fix ethcore after Vm interface change

* Move informant inside Interpreter struct

* Move do_trace to Interpreter struct

* Move all remaining exec variables to Interpreter struct

* Refactor VM to allow single opcode step

* Fix all EVM tests

* Fix all wasm tests

* Fix wasm runner tests

* Fix a check case where code length is zero

* Fix jsontests compile

* Fix cargo lock

* Use match instead of expect

* Use cheaper check reader.len() == 0 for the initial special case

* Get rid of try_and_done! macro by using Result<(), ReturnType>

* Use Never instead of ()

* Fix parity-bytes path

* Bypass gasometer lifetime problem by borrow only for a instance

* typo: missing {

* Fix ethcore test compile

* Fix evm tests

ethcore/vm/src/lib.rs

@@ -48,5 +48,5 @@ pub trait Vm {
 	/// This function should be used to execute transaction.
 	/// It returns either an error, a known amount of gas left, or parameters to be used
 	/// to compute the final gas left.
-	fn exec(&mut self, params: ActionParams, ext: &mut Ext) -> Result<GasLeft>;
+	fn exec(&mut self, ext: &mut Ext) -> Result<GasLeft>;
 }