Implements `json_metadata` RPC call (#692)
* Adds `impl_json_metadata!` for generating all metadata of a runtime * Adds `json_metadata` RPC call * Adds simple test for the `json_metadata` RPC call * Implements json metadata in the demo runtime * Fix indent * Adds missing copyright headers * Dispatch json metadata renamings and improvements * Replaces `format!` & `String` with `Vec<JSONMetadata` * Implements `Encode` and `Decode` for JSONMetadata * Make `impl_json_metadata!` compileable on `no_std` * Adapt the client to decode the correct type for `json_metadata` * Fixes compile error and warning * Whitespace
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68137aea
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