Implement a proper generic resolution in decl_storage! (#2913)

* Add failing test case

* move storage maps to blake2_128 (#2268)

* remove default hash, introduce twox_128 and blake2

* use blake2_128 & create ext_blake2_128

* refactor code

* add benchmark

* factorize generator

* fix

* parameterizable hasher

* some fix

* fix

* fix

* fix

* metadata

* fix

* remove debug print

* map -> blake2_256

* fix test

* fix test

* Apply suggestions from code review

Co-Authored-By: thiolliere <gui.thiolliere@gmail.com>

* impl twox 128 concat (#2353)

* impl twox_128_concat

* comment addressed

* fix

* impl twox_128->64_concat

* fix test

* Fix compilation and cleanup some docs

* Lol

* Remove traits from storage types that are not generic

* Get instance test almost working as wanted

* Make `srml-support-test` compile again :)

* Fixes test of srml-support

* Fix compilation

* Break some lines

* Remove incorrect macro match arm

* Integrates review feedback

* Update documentation

* Fix compilation

substrate/srml/contracts/src/lib.rs

@@ -257,7 +257,7 @@ where
 	fn trie_id(account_id: &T::AccountId) -> TrieId {
 		// Note that skipping a value due to error is not an issue here.
 		// We only need uniqueness, not sequence.
-		let new_seed = <AccountCounter<T>>::mutate(|v| {
+		let new_seed = AccountCounter::mutate(|v| {
 			*v = v.wrapping_add(1);
 			*v
 		});
@@ -353,7 +353,7 @@ decl_module! {
 			}
 
 			Self::deposit_event(RawEvent::ScheduleUpdated(schedule.version));
-			<CurrentSchedule<T>>::put(schedule);
+			CurrentSchedule::put(schedule);
 
 			Ok(())
 		}
@@ -609,7 +609,7 @@ decl_module! {
 		}
 
 		fn on_finalize() {
-			<GasSpent<T>>::kill();
+			GasSpent::kill();
 		}
 	}
 }