decl_storage as a proc_macro (#1176)

* `decl_storage` parsing of the macro (TODO change tool crate structure)

* Start formatting, for now use inner macro.
Still missing optional formating last part (genesis ...).

* Calling extra genesis macro

* decl_storage lines parsing.

* genesis macro as quote (need some cleaning reorg)

* dirty $crate substitute

* proc crate reorg.

* PR impl : skip usage of phantom data, it only applies in test and
council (others required it).

* Remaining macro of decl_storage, warning stringify behave sometime
oddly.

* Formatting code and some cleaning.

* Include line parsing to main struct (cannot use existing macro anymore).

* Remove genesis phantom data when there is already a field with type
parameter.

* Revert wasm files

* Remove old version of `decl_storage`.

* Fix false positive for phantom trait (additional type check on config
build).

* slight changes:
- return token errors instead of panic
- do not use useless intermediate vec

* Update srml/support/procedural/tools/derive/src/lib.rs

remove indent

Co-Authored-By: cheme <emericchevalier.pro@gmail.com>

* Switch iterations to fold, remove unused import.

substrate/srml/session/src/lib.rs

@@ -296,16 +296,13 @@ mod tests {
 		t.extend(consensus::GenesisConfig::<Test>{
 			code: vec![],
 			authorities: vec![1, 2, 3],
-			_genesis_phantom_data: Default::default(),
 		}.build_storage().unwrap().0);
 		t.extend(timestamp::GenesisConfig::<Test>{
 			period: 5,
-			_genesis_phantom_data: Default::default(),
 		}.build_storage().unwrap().0);
 		t.extend(GenesisConfig::<Test>{
 			session_length: 2,
 			validators: vec![1, 2, 3],
-			_genesis_phantom_data: Default::default(),
 		}.build_storage().unwrap().0);
 		runtime_io::TestExternalities::new(t)
 	}