v0.7.0 - Move origin metadata loading from DepositLoader to base PackageLoader. - Add structure ExtrinsicMetadataItem, to replace tuples. - deposit loader: Write revision metadata to the metadata storage. - Make the base PackageLoader write extrinsic revision metadata. - Rename PackageInfo.raw to PackageInfo.raw_info and remove it from BasePackageInfo. - Use attributes of *PackageInfo objects instead of untyped dicts. - Use an attr class for p_info instead of a dict. - test_resolve_revision_from_edge_cases: fix argument names/order.