Sensible scheduling for referenda (#2753)

* Nonlinear locking and cleanups

* Bump runtime version

* Minor cleanup

* Fix tests

* Fix council tests

* Fix flaw in turnout counting

* Initial work on referendum schedules

* Refactor council-democracy interface.

* Fix build

* Update srml/democracy/src/lib.rs

Co-Authored-By: Luke Schoen <ltfschoen@users.noreply.github.com>

* Update srml/democracy/src/lib.rs

Co-Authored-By: Luke Schoen <ltfschoen@users.noreply.github.com>

* Tests compile again

* Tests!

* Update todo

* Fix build

* Ensure votes arer not double-counted on member-transitions

* Extra logic for normal council changes

* Typo

* A few grumbles addressed.

substrate/srml/support/src/metadata.rs

@@ -246,7 +246,8 @@ mod tests {
 
 	mod system {
 		pub trait Trait {
-			type Origin: Into<Option<RawOrigin<Self::AccountId>>> + From<RawOrigin<Self::AccountId>>;
+			type Origin: Into<Result<RawOrigin<Self::AccountId>, Self::Origin>>
+				+ From<RawOrigin<Self::AccountId>>;
 			type AccountId;
 			type BlockNumber;
 		}

substrate/srml/support/src/origin.rs

@@ -112,12 +112,12 @@ macro_rules! impl_outer_origin {
 				$name::system(x)
 			}
 		}
-		impl Into<Option<$system::Origin<$runtime>>> for $name {
-			fn into(self) -> Option<$system::Origin<$runtime>> {
+		impl Into<$crate::rstd::result::Result<$system::Origin<$runtime>, $name>> for $name {
+			fn into(self) -> $crate::rstd::result::Result<$system::Origin<$runtime>, Self> {
 				if let $name::system(l) = self {
-					Some(l)
+					Ok(l)
 				} else {
-					None
+					Err(self)
 				}
 			}
 		}
@@ -132,12 +132,18 @@ macro_rules! impl_outer_origin {
 					$name::$module(x)
 				}
 			}
-			impl Into<Option<$module::Origin $( <$generic_param $(, $generic_instance )? > )*>> for $name {
-				fn into(self) -> Option<$module::Origin $( <$generic_param $(, $generic_instance )? > )*> {
+			impl Into<$crate::rstd::result::Result<
+				$module::Origin $( <$generic_param $(, $generic_instance )? > )*,
+				$name
+			>> for $name {
+				fn into(self) -> $crate::rstd::result::Result<
+					$module::Origin $( <$generic_param $(, $generic_instance )? > )*,
+					Self
+				> {
 					if let $name::$module(l) = self {
-						Some(l)
+						Ok(l)
 					} else {
-						None
+						Err(self)
 					}
 				}
 			}

substrate/srml/support/src/traits.rs

@@ -26,12 +26,26 @@ use crate::runtime_primitives::traits::{
 
 use super::for_each_tuple;
 
-/// New trait for querying a single fixed value from a type.
+/// A trait for querying a single fixed value from a type.
 pub trait Get<T> {
 	/// Return a constant value.
 	fn get() -> T;
 }
 
+/// A trait for querying whether a type can be said to statically "contain" a value. Similar
+/// in nature to `Get`, except it is designed to be lazy rather than active (you can't ask it to
+/// enumerate all values that it contains) and work for multiple values rather than just one.
+pub trait Contains<T> {
+	/// Return `true` if this "contains" the given value `t`.
+	fn contains(t: &T) -> bool;
+}
+
+impl<V: PartialEq, T: Get<V>> Contains<V> for T {
+	fn contains(t: &V) -> bool {
+		&Self::get() == t
+	}
+}
+
 /// The account with the given id was killed.
 pub trait OnFreeBalanceZero<AccountId> {
 	/// The account was the given id was killed.