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/runtime/wasm/Cargo.lock

@@ -1499,6 +1499,7 @@ dependencies = [
  "sr-std 2.0.0",
  "sr-version 2.0.0",
  "srml-aura 2.0.0",
+ "srml-authorship 0.1.0",
  "srml-balances 2.0.0",
  "srml-contracts 2.0.0",
  "srml-council 2.0.0",
@@ -2452,6 +2453,19 @@ dependencies = [
  "substrate-primitives 2.0.0",
 ]
 
+[[package]]
+name = "srml-authorship"
+version = "0.1.0"
+dependencies = [
+ "parity-codec 4.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sr-io 2.0.0",
+ "sr-primitives 2.0.0",
+ "sr-std 2.0.0",
+ "srml-support 2.0.0",
+ "srml-system 2.0.0",
+ "substrate-primitives 2.0.0",
+]
+
 [[package]]
 name = "srml-balances"
 version = "2.0.0"
@@ -2642,6 +2656,7 @@ dependencies = [
  "srml-metadata 2.0.0",
  "srml-support-procedural 2.0.0",
  "substrate-inherents 2.0.0",
+ "substrate-primitives 2.0.0",
 ]
 
 [[package]]