Tabmat

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**Bug fix:**

- Fixed the loading of jemalloc in Apple Silicon wheels.

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**Other changes:**

- Build and upload wheels for Apple Silicon.

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**Other changes:**

- Next attempt to build wheel for PyPI without ``march=native``.

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**Other changes:**

- Add Python 3.10 support to CI (remove Python 3.6).
- Build wheel for PyPI without ``march=native``.

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**New feature**

- :class:`tabmat.CategoricalMatrix` now accepts a `drop_first` argurment. This allows the user to drop the first column of a CategoricalMatrix to avoid multicollinearity problems in unregularized models.
- :class:`tabmat.StandardizedMatrix` and :class:`tabmat.MatrixBase` now support the `multiply` method.

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**Bug fix**

- Always use 64bit integers for indexing in :meth:`tabmat.ext.sparse.sparse_sandwich` to avoid segmentation faults on very wide problems.