Dataiter

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* Adapt to changes in NumPy 2.0
* Bump NumPy dependency to >= 2.0

This is a minimal change to be NumPy 2.0 compatible. In the 0.99+
releases, we plan to adopt the new NumPy string dtype and fix any
regressions that come up, leading to a 1.0 release when everything looks
to be working reliably (26). Anyone looking for extreme stability
should consider avoiding the 0.99+ releases and waiting for 1.0.

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* Mark NumPy dependency as < 2.0

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* `ListOfDicts.drop_na`: New method
* `ListOfDicts.keys`: New method
* `ListOfDicts.print_memory_use`: New method
* Fix tabular display of Unicode characters with width != 1
* Add dependency on wcwidth: https://pypi.org/project/wcwidth

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* `dt`: Handle all NaT input
* Migrate from `setup.py` to `hatch` and `pyproject.toml`

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* `Vector.as_datetime`: Add `precision` argument
* `Vector.concat`: New method
* `Vector.sort`: Fix sorting object vectors

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* `DataFrame`: Fix column and method name clash errors in certain operations
* `dt.replace`: Allow vector arguments the same length as `x`