Runtime logging. (#3821)

* Implement Printable for tuples.

* Add debugging function.

* Add debug 1.

* Implement  for everything.

* RuntimeDebug derive.

* Introduce RuntimeDebug.

* Add some dummy logging.

* Replace RuntimeDebug with Debug.

* Revert "Replace RuntimeDebug with Debug."

This reverts commit bc47070a8cb30241b2b590b2fa29fd195088162f.

* Working on Debug for all.

* Fix bounds.

* Add debug utils.

* Implement runtime logging.

* Add some docs and clean up.

* Clean up derives.

* Fix custom derive impl.

* Bump runtime.

* Fix long lines.

* Fix doc test.

* Use CARGO_CFG_STD.

* Revert "Use CARGO_CFG_STD."

This reverts commit ea429566de18ed0fa052571b359eb9826a64a9f4.

* Use parse_macro_input

* Update lockfile.

* Apply review suggestions.

* Remove stray re-export.

* Add no-std impl.

* Update lockfile.

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

@@ -62,8 +62,8 @@ macro_rules! create_apis_vec {
 /// This triplet have different semantics and mis-interpretation could cause problems.
 /// In particular: bug fixes should result in an increment of `spec_version` and possibly `authoring_version`,
 /// absolutely not `impl_version` since they change the semantics of the runtime.
-#[derive(Clone, PartialEq, Eq, Encode, Default)]
-#[cfg_attr(feature = "std", derive(Debug, Serialize, Deserialize, Decode))]
+#[derive(Clone, PartialEq, Eq, Encode, Default, sr_primitives::RuntimeDebug)]
+#[cfg_attr(feature = "std", derive(Serialize, Deserialize, Decode))]
 #[cfg_attr(feature = "std", serde(rename_all = "camelCase"))]
 pub struct RuntimeVersion {
 	/// Identifies the different Substrate runtimes. There'll be at least polkadot and node.
@@ -147,7 +147,7 @@ impl RuntimeVersion {
 }
 
 #[cfg(feature = "std")]
-#[cfg_attr(feature = "std", derive(Debug))]
+#[derive(Debug)]
 pub struct NativeVersion {
 	/// Basic runtime version info.
 	pub runtime_version: RuntimeVersion,