Synchronize with Substrate (#71)

* Synchronize and reduce duff with Substrate

* Add helper script for syncing with Substrate

* Add `RuntimeBlockWeights` and `RuntimeBlockLength` back

* Add imports and definition

* Add invocation comment

.rustfmt.toml

@@ -7,6 +7,9 @@ imports_granularity = "Crate"
 reorder_imports = true
 # Consistency
 newline_style = "Unix"
+# Format comments
+comment_width = 100
+wrap_comments = true
 # Misc
 chain_width = 80
 spaces_around_ranges = false
@@ -19,4 +22,4 @@ trailing_comma = "Vertical"
 trailing_semicolon = false
 use_field_init_shorthand = true
 # Canvas specific
-license_template_path = "FILE_HEADER"
+license_template_path = "FILE_HEADER"