Implement parameterisable modules (#1800)

* first implementation

* remove done comment

* origin done

* impl log for instance

* impl inherent for instance

* Fix wasm build + full example build

this requires parity codec implements codec for core::marker::PhantomData

* patch parity-codec link to github branch

* improve internal names and fix instance prefix

* Fix in macros

* add test modules for support

this allow to test for construct_runtime as well.

The reason to have put that in another crate is:
* if we put test in `tests/` dir of srml/support then decl_storage fails to get
  srml-support access because it believes it is inside srml-support
  crate and so derive access to `quote!{ crate }` but this is wrong
  (and I don't see any way to prevent that, and it only bother us so I
  don't think that matters that much)
* if we put test inside lib.rs then contruct_runtime cannot be used
  because it call some macros that are defined with macros
  (decl_outer_event and decl_outer_origin) and thus rustc complains.

* defaultinstance to its own struct to avoid errors

* enforce <T, I> for Event and Config, impl test

* add origin, log, inherent to test

* test more code generation

* basic storage test

* fix typo

* rename a few imports and field

* delete wip test in example and runtime

* change default prefix to make it backward compatible with test

* rename Instance to I and Instantiable to Instance

note: the name of generic parameter I is only enforce by decl_module!
and this could be rewritten

* doc

* clean old TODOs

* update parity-codec to 3.2

* update node impl version + builds

* fix warning

* fix unrelated grandpa test

* refactor code

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

@@ -39,14 +39,20 @@ struct StorageDefinition {
 	pub module_ident: Ident,
 	pub mod_lt_token: Token![<],
 	pub mod_param: syn::GenericParam,
+	pub mod_instance_param_token: Option<Token![,]>,
+	pub mod_instance: Option<syn::Ident>,
+	pub mod_instantiable_token: Option<Token![:]>,
+	pub mod_instantiable: Option<syn::Ident>,
+	pub mod_default_instance_token: Option<Token![=]>,
+	pub mod_default_instance: Option<syn::Ident>,
 	pub mod_gt_token: Token![>],
 	pub as_token: Token![as],
 	pub crate_ident: Ident,
 	pub content: ext::Braces<ext::Punctuated<DeclStorageLine, Token![;]>>,
 	pub extra_genesis: Option<AddExtraGenesis>,
+	pub extra_genesis_skip_phantom_data_field: Option<ExtraGenesisSkipPhantomDataField>,
 }
 
-
 #[derive(Parse, ToTokens, Debug)]
 struct SpecificHiddenCrate {
 	pub keyword: ext::CustomToken<SpecificHiddenCrate>,
@@ -59,6 +65,12 @@ struct AddExtraGenesis {
 	pub content: ext::Braces<AddExtraGenesisContent>,
 }
 
+#[derive(Parse, ToTokens, Debug)]
+struct ExtraGenesisSkipPhantomDataField {
+	pub genesis_phantom_keyword: ext::CustomToken<ExtraGenesisSkipPhantomDataField>,
+	pub token: Token![;],
+}
+
 #[derive(Parse, ToTokens, Debug)]
 struct AddExtraGenesisContent {
 	pub lines: ext::Punctuated<AddExtraGenesisLineEnum, Token![;]>,
@@ -153,3 +165,4 @@ custom_keyword_impl!(AddExtraGenesis, "add_extra_genesis", "storage extra genesi
 custom_keyword_impl!(DeclStorageGetter, "get", "storage getter");
 custom_keyword!(MapKeyword, "map", "map as keyword");
 custom_keyword!(LinkedMapKeyword, "linked_map", "linked_map as keyword");
+custom_keyword_impl!(ExtraGenesisSkipPhantomDataField, "extra_genesis_skip_phantom_data_field", "extra_genesis_skip_phantom_data_field as keyword");