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/support/src/lib.rs

@@ -31,6 +31,9 @@ extern crate srml_metadata;
 
 extern crate mashup;
 
+#[macro_use]
+extern crate srml_support_procedural;
+
 #[cfg(test)]
 #[macro_use]
 extern crate pretty_assertions;
@@ -67,6 +70,9 @@ pub use self::dispatch::{Parameter, Dispatchable, Callable, IsSubType};
 pub use self::metadata::RuntimeMetadata;
 pub use runtime_io::print;
 
+#[doc(inline)]
+pub use srml_support_procedural::decl_storage;
+
 #[macro_export]
 macro_rules! fail {
 	( $y:expr ) => {{

substrate/srml/support/src/metadata.rs

@@ -188,7 +188,6 @@ mod tests {
 				StorageMethod : Option<u32>;
 			}
 			add_extra_genesis {
-			    config(_marker) : ::std::marker::PhantomData<T>;
 			    build(|_, _, _| {});
 			}
 		}