Initial mechanics for 80:20 fee split (#2912)

* Initial mechanics for 80:20 fee split

Also:
- Introduce extra functions for Imbalance manipulation;
- Store treasury pot in an account, letting total issuance account for
  it.

* Fix some tests

* Fix some tests

* Minor cleanups

* Update parity-codec version (#2855)

* Update parity-codec version

* Update grandpa, rhododendron and trie-bench

* Use primitive-types from crates.io

* Bump impl version

* Fix trie-bench version

* Fix lock files

* Fix versions

* Update codec to 4.1

* merge fix

* Revert merge

* More reversions

* Remove accidental code

* Update locks

* Bump runtime

* Update locks

* Tweaks and label TODO

* Update srml/treasury/src/lib.rs

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

* Update issue number

* Update core/sr-primitives/src/traits.rs

Co-Authored-By: Robert Habermeier <rphmeier@gmail.com>

* Fix wasm build

* Fix subkey build

substrate/node/executor/src/lib.rs

@@ -54,7 +54,7 @@ mod tests {
 	use system::{EventRecord, Phase};
 	use node_runtime::{Header, Block, UncheckedExtrinsic, CheckedExtrinsic, Call, Runtime, Balances,
 		BuildStorage, GenesisConfig, BalancesConfig, SessionConfig, StakingConfig, System,
-		SystemConfig, GrandpaConfig, IndicesConfig, Event, SessionKeys};
+		SystemConfig, GrandpaConfig, IndicesConfig, Event, SessionKeys, Treasury};
 	use wabt;
 	use primitives::map;
 
@@ -566,6 +566,34 @@ mod tests {
 					event: Event::system(system::Event::ExtrinsicSuccess),
 					topics: vec![],
 				},
+				EventRecord {
+					phase: Phase::ApplyExtrinsic(1),
+					event: Event::indices(
+						indices::RawEvent::NewAccountIndex(Treasury::account_id(), 6)
+					),
+					topics: vec![],
+				},
+				EventRecord {
+					phase: Phase::ApplyExtrinsic(1),
+					event: Event::balances(
+						balances::RawEvent::NewAccount(Treasury::account_id(), 0)
+					),
+					topics: vec![],
+				},
+				EventRecord {
+					phase: Phase::ApplyExtrinsic(1),
+					event: Event::indices(
+						indices::RawEvent::NewAccountIndex(Default::default(), 7)
+					),
+					topics: vec![],
+				},
+				EventRecord {
+					phase: Phase::ApplyExtrinsic(1),
+					event: Event::balances(
+						balances::RawEvent::NewAccount(Default::default(), 1)
+					),
+					topics: vec![],
+				},
 				EventRecord {
 					phase: Phase::ApplyExtrinsic(1),
 					event: Event::balances(balances::RawEvent::Transfer(