Asdf-astropy

------------------

- Update pins for ``asdf``, ``asdf-coordinates-schemas``, ``numpy``, and ``packaging``. [164]
- Add serialization support for non-VOunits. [142]
- Add serialization support for ``MagUnit`` based units. [146]
- Document and add ``assert_model_roundtrip`` and ``assert_table_roundtrip`` to
``asdf_astropy.testing.helpers``. [170]

------------------

- Update citations. [111]
- Switch to using ``pyproject.toml`` for package configuration. [106]
- Fix bug with ``memmap`` of ``Quantity`` objects. [125]
- Drop support for ``numpy-1.18``. [116]
- Fix bug with ``str`` representations of ``astropy.time`` objects. [132]
- Fix bug in preserving the ``dtype`` of ``Quantity`` objects. [131]

------------------

- Add converter for the new ``Schechter1D`` model. [67]
- Add CITATION file. [71]
- Add migration and quick-start documentation guides, and update minimum Python version [77]
- Update ``FrameConverter`` to enable the use of multiple tags. [81]
- Bugfixes for ``astropy.time`` converters. [86]
- Remove unnecessary ``tag:`` from schemas. [103]
- Add converters for ``ModelBoundingBox`` and ``CompoundBoundingBox``. [69]

------------------

- Migrate documentation from ``astropy`` to ``asdf-astropy``. [55]
- Pin astropy min version to 5.0.4. [62]

------------------

- Add support for serialization and deserialization of input_units_equivalencies
for astropy models. [37]
- Bugfix for units_mapping schema's property name conflicts. Changes:
- ``inputs`` to ``unit_inputs``
- ``outputs`` to ``unit_outputs`` [39]
- Add converter support for Cosine1D, Tangent1D, ArcSine1D, ArcCosine1D, ArcTangent1D
models. [42]
- Add converter for Spline1D model. [43]
- Add astropy Table connector for ASDF. [47]
- Move assert_model_equal to helpers module. [50]
- Fix warnings raised during testing. [52]

------------------

- Fix bug in Table deserializer when meta is absent from the ASDF. [36]