Make all PerThing types implement all trait methods on the type (#5422)

This removes the requirement to import `PerThing` to use a type that
implements the trait.

substrate/frame/babe/src/lib.rs

@@ -28,7 +28,7 @@ use frame_support::{
 	weights::{Weight, SimpleDispatchInfo, WeighData},
 };
 use sp_timestamp::OnTimestampSet;
-use sp_runtime::{generic::DigestItem, ConsensusEngineId, Perbill, PerThing};
+use sp_runtime::{generic::DigestItem, ConsensusEngineId, Perbill};
 use sp_runtime::traits::{IsMember, SaturatedConversion, Saturating, Hash, One};
 use sp_staking::{
 	SessionIndex,

substrate/frame/grandpa/src/lib.rs

@@ -34,7 +34,7 @@ use sp_std::prelude::*;
 use codec::{self as codec, Encode, Decode};
 use frame_support::{decl_event, decl_storage, decl_module, decl_error, storage};
 use sp_runtime::{
-	DispatchResult, generic::{DigestItem, OpaqueDigestItemId}, traits::Zero, Perbill, PerThing,
+	DispatchResult, generic::{DigestItem, OpaqueDigestItemId}, traits::Zero, Perbill,
 };
 use sp_staking::{
 	SessionIndex,

substrate/frame/im-online/src/lib.rs

@@ -81,7 +81,7 @@ use pallet_session::historical::IdentificationTuple;
 use sp_runtime::{
 	offchain::storage::StorageValueRef,
 	RuntimeDebug,
-	traits::{Convert, Member, Saturating, AtLeast32Bit}, Perbill, PerThing,
+	traits::{Convert, Member, Saturating, AtLeast32Bit}, Perbill,
 	transaction_validity::{
 		TransactionValidity, ValidTransaction, InvalidTransaction, TransactionSource,
 		TransactionPriority,

substrate/frame/staking/src/inflation.rs

@@ -19,7 +19,7 @@
 //! The staking rate in NPoS is the total amount of tokens staked by nominators and validators,
 //! divided by the total token supply.
 
-use sp_runtime::{Perbill, PerThing, traits::AtLeast32Bit, curve::PiecewiseLinear};
+use sp_runtime::{Perbill, traits::AtLeast32Bit, curve::PiecewiseLinear};
 
 /// The total payout to all validators (and their nominators) per era.
 ///

substrate/frame/staking/src/slashing.rs

@@ -52,7 +52,7 @@ use super::{
 	EraIndex, Trait, Module, Store, BalanceOf, Exposure, Perbill, SessionInterface,
 	NegativeImbalanceOf, UnappliedSlash,
 };
-use sp_runtime::{traits::{Zero, Saturating}, PerThing, RuntimeDebug};
+use sp_runtime::{traits::{Zero, Saturating}, RuntimeDebug};
 use frame_support::{
 	StorageMap, StorageDoubleMap,
 	traits::{Currency, OnUnbalanced, Imbalance},