Extensible transactions (and tips) (#3102)

* 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.

* Ignore expensive test.

* Bump.

substrate/core/test-runtime/src/system.rs

@@ -23,7 +23,8 @@ use runtime_support::storage::{self, StorageValue, StorageMap};
 use runtime_support::storage_items;
 use runtime_primitives::traits::{Hash as HashT, BlakeTwo256, Header as _};
 use runtime_primitives::generic;
-use runtime_primitives::{ApplyError, ApplyOutcome, ApplyResult, transaction_validity::TransactionValidity};
+use runtime_primitives::{ApplyError, ApplyOutcome, ApplyResult};
+use runtime_primitives::transaction_validity::{TransactionValidity, ValidTransaction};
 use parity_codec::{KeyedVec, Encode};
 use super::{
 	AccountId, BlockNumber, Extrinsic, Transfer, H256 as Hash, Block, Header, Digest, AuthorityId
@@ -175,13 +176,13 @@ pub fn validate_transaction(utx: Extrinsic) -> TransactionValidity {
 		p
 	};
 
-	TransactionValidity::Valid {
+	TransactionValidity::Valid(ValidTransaction {
 		priority: tx.amount,
 		requires,
 		provides,
 		longevity: 64,
 		propagate: true,
-	}
+	})
 }
 
 /// Execute a transaction outside of the block execution function.