Clean up sr-io (#3609)

* Move trait `Printable` into `sr-primitives`

* Cleanup runtime io trie_root interfaces

* Remove last generic bits from sr-io interface

* Fix srml-sudo after master merge

* Fix benchmarks

* Runtime bump

substrate/core/sr-primitives/src/lib.rs

@@ -699,7 +699,7 @@ impl DispatchError {
 	}
 }
 
-impl runtime_io::Printable for DispatchError {
+impl traits::Printable for DispatchError {
 	fn print(&self) {
 		"DispatchError".print();
 		if let Some(module) = self.module {
@@ -895,6 +895,11 @@ impl traits::Extrinsic for OpaqueExtrinsic {
 	type SignaturePayload = ();
 }
 
+/// Print something that implements `Printable` from the runtime.
+pub fn print(print: impl traits::Printable) {
+	print.print();
+}
+
 #[cfg(test)]
 mod tests {
 	use super::DispatchError;