Fix contracts instantiation (#51)

* Move contracts tests to contracts module

* Add test for instantiating a contract

* Fix InstantiateArgs encoding

* Ignore PhantomData primitives, they are 0

* Increase endowment and log code hash

* Update SystemEvent

* Fix codec import

* Oops

* Write buffer directly to output to avoid encoding vec

* Debug with StorageChanges encoded as hex

* Logging and format code

src/frame/system.rs

@@ -169,11 +169,13 @@ pub fn set_code(code: Vec<u8>) -> Call<SetCode> {
     Call::new(MODULE, SET_CODE, code)
 }
 
+use frame_support::weights::DispatchInfo;
+
 /// Event for the System module.
 #[derive(Clone, Debug, codec::Decode)]
 pub enum SystemEvent {
     /// An extrinsic completed successfully.
-    ExtrinsicSuccess(frame_support::weights::DispatchInfo),
+    ExtrinsicSuccess(DispatchInfo),
     /// An extrinsic failed.
-    ExtrinsicFailed(sp_runtime::DispatchError),
+    ExtrinsicFailed(sp_runtime::DispatchError, DispatchInfo),
 }