tabmat 4.0.0a1

What's Changed

• Large refactoring. DenseMatrix and SparseMatrix do not inherit directly from numpy.ndarray and scipy.sparse.csc_matrix. Rather, they use the __array_ufunc__ interface. by @MartinStancsicsQC.
• Add column name metadata to tabmat matrices by @MartinStancsicsQC in #278
• Allow the creation of tabmat matrices from Wilkinson-formulas by @MatthiasSchmidtblaicherQC @MartinStancsicsQC and @xhochy in #267
• Allow missing values in CategoricalMatrix by @MartinStancsicsQC in #281
• Improve the performance of from_pandas in the case of low-cardinality categoricals by @MartinStancsicsQC in #275
• Add pickled benchmark data to .gitignore by @MartinStancsicsQC in #282
• Use boa to build conda packages by @jtilly in #285

Full Changelog: 3.1.10...4.0.0a1