v6.13.0 bug fixes: * QualifiedSWHID: Fix (de)serialization of 'origin' qualifier new features: * Add size limit to origin URLs * Add 'evolve' method to BaseModel objects (backward-compatible) API changes: * model: rename TargetType to SnapshotTargetType and ObjectType to ReleaseTargetType (with aliases so code depending on the old names doesn't break) * from_disk: introduce ModelObjectType and FromDiskType enums, to replace strings * extend model.Content to make DiskBackedContent redundant * model: adds type annotation for iter_directory internal: * model: Improve typing syntax with __future__.annotations * test: fix bogus "tzfile" representation on the fly in test_repr