Update parity-wasm to 0.40 (#3631)

* updated direct dependencies to parity-wasm

* fixed tests and incremented impl_version of the runtime

* update wasmi to 0.5.1 in sr-sandbox, bringing all parity-wasm deps up to 0.40

substrate/node/runtime/src/lib.rs

@@ -83,7 +83,7 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
 	// implementation changes and behavior does not, then leave spec_version as
 	// is and increment impl_version.
 	spec_version: 158,
-	impl_version: 159,
+	impl_version: 160,
 	apis: RUNTIME_API_VERSIONS,
 };