Bring back MaxNominations as a metadata constant (paritytech#10947)

Tidy Democracy (paritytech#10867)

* add test

* Assorted refactorings

* complete test

* saturating math

* final check

* use `default`

Co-authored-by: Gav Wood <gavin@parity.io>

Bump `strum` from 0.22 -> 0.23 (paritytech#10758)

Expose Uniques helper functions and DestroyWitness fields (paritytech…

…#10529)

Prep sp-version for release

Prepare `sp-runtime` for publication (paritytech#10451)

* Bump versions of sp-core and dependencies to v4.0.0

* Update references from `4.0.0-dev` –> `4.0.0`

* Funny whitespace

* Funny whitespace 2

* Prepare `sp-runtime` for publication

Release sp-core 4.0.0 (paritytech#10447)

* Bump versions of sp-core and dependencies to v4.0.0

* Update references from `4.0.0-dev` –> `4.0.0`

* Funny whitespace

* Funny whitespace 2

Fix order of hook execution (paritytech#10043)

* fix order

* Update frame/support/procedural/src/construct_runtime/mod.rs

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

* format

* more accurate description

* format

* better explicit types

* fix tests

* address feedback

* add a type to ease non breaking implementation

* add comment about constraint

* fix test

* add test for generated types

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

Switch to Rust 2021 (paritytech#10170)

* Switch to Rust 2021

* Update trybuild to fix errors

Fuzzer for Pallet Bags List (paritytech#9851)

* Fuzzer for Pallet Bags List

* Some small updates

* Fuzzer for Pallet Bags List

This PR adds a fuzzer for the `SortedListProvider` API exposed by pallet-bags-list.

* Feature gate code NOT used by fuzz feature

* Create Enum for list actions

* fix some small mistakes

* try and make CI happy

* fmt

* Do not insert before updating

* clean up some misc. comments

* marginally improve Node::sanity_check

* Change ID_RANGE to 25_000

* comma

* try improve correct feature gating so no unused code

Co-authored-by: thiolliere <gui.thiolliere@gmail.com>