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/support/procedural/src/storage/mod.rs

@@ -67,7 +67,6 @@ struct StorageDefinition {
 	pub crate_ident: Ident,
 	pub content: ext::Braces<ext::Punctuated<DeclStorageLine, Token![;]>>,
 	pub extra_genesis: ext::Opt<AddExtraGenesis>,
-	pub extra_genesis_skip_phantom_data_field: ext::Opt<ExtraGenesisSkipPhantomDataField>,
 }
 
 #[derive(Parse, ToTokens, Debug)]
@@ -82,12 +81,6 @@ struct AddExtraGenesis {
 	pub content: ext::Braces<AddExtraGenesisContent>,
 }
 
-#[derive(Parse, ToTokens, Debug)]
-struct ExtraGenesisSkipPhantomDataField {
-	pub genesis_phantom_keyword: keyword::extra_genesis_skip_phantom_data_field,
-	pub token: Token![;],
-}
-
 #[derive(Parse, ToTokens, Debug)]
 struct AddExtraGenesisContent {
 	pub lines: ext::Punctuated<AddExtraGenesisLineEnum, Token![;]>,