2.0.0

What's Changed

• remove deprecated models by @braingram in #171
• Remove deprecated by @braingram in #298
• remove jwst.datamodels.schema submodule by @braingram in #175
• Free references to overwritten attributes by @braingram in #301
• remove python 2 slicing api by @braingram in #302
• remove deprecated_properties by @braingram in #303
• JP-3581: add badpix_selfcal step to core schema by @emolter in #305

Full Changelog: 1.10.1...2.0.0