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/staking/src/mock.rs

@@ -88,12 +88,10 @@ pub fn new_test_ext(
 	t.extend(consensus::GenesisConfig::<Test>{
 		code: vec![],
 		authorities: vec![],
-		_genesis_phantom_data: Default::default(),
 	}.build_storage().unwrap().0);
 	t.extend(session::GenesisConfig::<Test>{
 		session_length,
 		validators: vec![10, 20],
-		_genesis_phantom_data: Default::default(),
 	}.build_storage().unwrap().0);
 	t.extend(balances::GenesisConfig::<Test>{
 		balances: if monied {
@@ -111,7 +109,6 @@ pub fn new_test_ext(
 		transfer_fee: 0,
 		creation_fee: 0,
 		reclaim_rebate: 0,
-		_genesis_phantom_data: Default::default(),
 	}.build_storage().unwrap().0);
 	t.extend(GenesisConfig::<Test>{
 		sessions_per_era,
@@ -125,11 +122,9 @@ pub fn new_test_ext(
 		current_session_reward: reward,
 		current_offline_slash: 20,
 		offline_slash_grace: 0,
-		_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);
 	runtime_io::TestExternalities::new(t)
 }