Weight annotation. (#3157)

* Make extrinsics extensible.

Also Remove old extrinsic types.

* Rest of mockup. Add tips.

* Fix some build issues

* Runtiem builds :)

* Substrate builds.

* Fix a doc test

* Compact encoding

* Extract out the era logic into an extension

* Weight Check signed extension. (#3115)

* Weight signed extension.

* Revert a bit + test for check era.

* Update Cargo.toml

* Update node/cli/src/factory_impl.rs

* Update node/executor/src/lib.rs

* Update node/executor/src/lib.rs

* Don't use len for weight - use data.

* Operational Transaction; second attempt (#3138)

* working poc added.

* some fixes.

* Update doc.

* Fix all tests + final logic.

* more refactoring.

* nits.

* System block limit in bytes.

* Silent the storage macro warnings.

* More logic more tests.

* Fix import.

* Refactor names.

* Fix build.

* Update srml/balances/src/lib.rs

* Final refactor.

* Bump transaction version

* Fix weight mult test.

* Fix more tests and improve doc.

* Bump.

* Make some tests work again.

* Fix subkey.

* Remove todos + bump.

* First draft of annotating weights.

* Refactor weight to u64.

* More refactoring and tests.

* New convert for weight to fee

* more tests.

* remove merge redundancy.

* Fix system test.

* Bring back subkey stuff.

* a few stress tests.

* fix some of the grumbles.

* Final nits.

* Update srml/system/src/lib.rs

Co-Authored-By: DemiMarie-parity <48690212+DemiMarie-parity@users.noreply.github.com>

* Scale weights by 1000.

* Bump.

* Fix decl_storage test.

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

@@ -166,7 +166,6 @@ impl<T> Convert<T, T> for Identity {
 
 /// A structure that performs standard conversion using the standard Rust conversion traits.
 pub struct ConvertInto;
-
 impl<A, B: From<A>> Convert<A, B> for ConvertInto {
 	fn convert(a: A) -> B { a.into() }
 }
@@ -771,6 +770,9 @@ pub enum DispatchError {
 	/// General error to do with the inability to pay some fees (e.g. account balance too low).
 	Payment,
 
+	/// General error to do with the exhaustion of block resources.
+	Resource,
+
 	/// General error to do with the permissions of the sender.
 	NoPermission,
 
@@ -794,11 +796,12 @@ impl From<DispatchError> for i8 {
 	fn from(e: DispatchError) -> i8 {
 		match e {
 			DispatchError::Payment => -64,
-			DispatchError::NoPermission => -65,
-			DispatchError::BadState => -66,
-			DispatchError::Stale => -67,
-			DispatchError::Future => -68,
-			DispatchError::BadProof => -69,
+			DispatchError::Resource => -65,
+			DispatchError::NoPermission => -66,
+			DispatchError::BadState => -67,
+			DispatchError::Stale => -68,
+			DispatchError::Future => -69,
+			DispatchError::BadProof => -70,
 		}
 	}
 }