Generalised proxies (#6156)

* Initial work

* It should work

* Fix node

* Fix tests

* Initial test

* Tests

* Expunge proxy functionality from democracy and elections

* Allow different proxy types

* Repotted

* Build

* Build

* Making a start on weights

* Undo breaking change

* Line widths.

* Fix

* fix tests

* finish benchmarks?

* Storage name!

* Utility -> Proxy

* proxy weight

* add proxy weight

* remove weights

* Update transfer constraint

* Again, fix constraints

* Fix negation

* Update frame/proxy/Cargo.toml

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

* Remove unneeded event.

* Grumbles

* Apply suggestions from code review

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

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

substrate/frame/utility/src/lib.rs

@@ -168,7 +168,7 @@ decl_error! {
 		WrongTimepoint,
 		/// A timepoint was given, yet no multisig operation is underway.
 		UnexpectedTimepoint,
-		/// A call with a `false` IsCallable filter was attempted.
+		/// A call with a `false` `IsCallable` filter was attempted.
 		Uncallable,
 	}
 }