Ranked Collective pallet (#11548)

* Ranked Collective pallet

* Fixes

* benchmarks

* Weights

* Allow class voting in rank
Use bare ayes for calculating support.
Allow only promotion/demotion by one rank only.
Allow removal of member with rank zero only.
Use new Tally API

* Index by rank, still O(1).

* Custom vote weights

* Formatting

* Update frame/ranked-collective/src/lib.rs

* Broken :(

* origin guard; cleanup uses new API

* Formatting

* Promote/demote by rank

* Formatting

* Use new API

* Remove code in another PR

* Remove code in another PR

* Formatting

* Remove code in another PR

* Docs

* Docs

* Bump

* Fixes

* Formatting

* Fixes

substrate/frame/support/src/storage/bounded_vec.rs

@@ -286,6 +286,12 @@ impl<T, S: Get<u32>> BoundedVec<T, S> {
 		Self::with_bounded_capacity(Self::bound())
 	}
 
+	/// Consume and truncate the vector `v` in order to create a new instance of `Self` from it.
+	pub fn truncate_from(mut v: Vec<T>) -> Self {
+		v.truncate(Self::bound());
+		Self::unchecked_from(v)
+	}
+
 	/// Get the bound of the type in `usize`.
 	pub fn bound() -> usize {
 		S::get() as usize