Logic for the (Core) Fellowship (#13503)

* More drafting

* Paymaster pallet

* Fix build

* More tests

* Rename

* Rename

* Renaming

* Revert old changes

* Multi-phase payouts to avoid bank-runs

* Tests

* Tests

* Allow payment to be targeted elsewhere

* Proper ssync payment failure handling

* Test for repayment

* Docs

* Impl RankedMembers for RankedCollective

* Implement Pay for Pot (i.e. basic account).

* Benchmarks

* Weights

* Introduce Salary benchmark into node

* Fix warning

* ".git/.scripts/commands/bench/bench.sh" pallet dev pallet_salary

* Update primitives/arithmetic/src/traits.rs

Co-authored-by: Jegor Sidorenko <5252494+jsidorenko@users.noreply.github.com>

* Update frame/salary/src/lib.rs

Co-authored-by: Jegor Sidorenko <5252494+jsidorenko@users.noreply.github.com>

* Update lib.rs

* Update frame/salary/src/lib.rs

Co-authored-by: joe petrowski <25483142+joepetrowski@users.noreply.github.com>

* Docs

* Update frame/salary/src/lib.rs

Co-authored-by: joe petrowski <25483142+joepetrowski@users.noreply.github.com>

* Update frame/salary/src/lib.rs

Co-authored-by: joe petrowski <25483142+joepetrowski@users.noreply.github.com>

* Fix

* Fixes

* Fixes

* Move some salary traits stuff to a shared location

* Initial draft

* Comment out bits

* Fix

* First couple of tests

* One more test

* Update frame/salary/src/lib.rs

Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Update frame/salary/src/lib.rs

Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Mul floor

* Tests

* Mul floor

* Fix warnings

* Fix test

* Tests

* Last tests

* Docs

* Fix warnings

* Benchmarks

* Weights

* Integrate benchmark

* Fixes

* Fix

* ".git/.scripts/commands/bench/bench.sh" pallet dev pallet_core_fellowship

* Better process flow

* Fix benchmarks & tests

* Docs

* Fixes

* Fixes

* docs

* ".git/.scripts/commands/bench/bench.sh" pallet dev pallet_core_fellowship

* Docs and allow custom evidence size

* ".git/.scripts/commands/bench/bench.sh" pallet dev pallet_core_fellowship

* Update frame/core-fellowship/src/lib.rs

Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>

* Update frame/core-fellowship/src/tests.rs

Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>

* Update frame/core-fellowship/src/benchmarking.rs

* Update frame/core-fellowship/src/benchmarking.rs

* Apply suggestions from code review

* Rename

* Update primitives/arithmetic/src/traits.rs

Co-authored-by: joe petrowski <25483142+joepetrowski@users.noreply.github.com>

* Reduce magic numbers

* Update frame/core-fellowship/src/lib.rs

Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Update frame/core-fellowship/src/lib.rs

Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Benchmark result

* Remove dependency

* set_params should pay

* induct should pay

* Remove some other free calls

---------

Co-authored-by: command-bot <>
Co-authored-by: Jegor Sidorenko <5252494+jsidorenko@users.noreply.github.com>
Co-authored-by: joe petrowski <25483142+joepetrowski@users.noreply.github.com>
Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>

substrate/primitives/arithmetic/src/traits.rs

@@ -148,6 +148,20 @@ impl<
 {
 }
 
+/// A meta trait for arithmetic.
+///
+/// Arithmetic types do all the usual stuff you'd expect numbers to do. They are guaranteed to
+/// be able to represent at least `u8` values without loss, hence the trait implies `From<u8>`
+/// and smaller integers. All other conversions are fallible.
+pub trait AtLeast8Bit: BaseArithmetic + From<u8> {}
+
+impl<T: BaseArithmetic + From<u8>> AtLeast8Bit for T {}
+
+/// A meta trait for arithmetic.  Same as [`AtLeast8Bit `], but also bounded to be unsigned.
+pub trait AtLeast8BitUnsigned: AtLeast8Bit + Unsigned {}
+
+impl<T: AtLeast8Bit + Unsigned> AtLeast8BitUnsigned for T {}
+
 /// A meta trait for arithmetic.
 ///
 /// Arithmetic types do all the usual stuff you'd expect numbers to do. They are guaranteed to
@@ -220,6 +234,24 @@ pub trait Saturating {
 	/// instead of overflowing.
 	fn saturating_pow(self, exp: usize) -> Self;
 
+	/// Decrement self by one, saturating at zero.
+	fn saturating_less_one(mut self) -> Self
+	where
+		Self: One,
+	{
+		self.saturating_dec();
+		self
+	}
+
+	/// Increment self by one, saturating at the numeric bounds instead of overflowing.
+	fn saturating_plus_one(mut self) -> Self
+	where
+		Self: One,
+	{
+		self.saturating_inc();
+		self
+	}
+
 	/// Increment self by one, saturating.
 	fn saturating_inc(&mut self)
 	where