Pyreadr

* renaming libbz2-1.dll to libbz2.dll, introducing lib files for zlib and bizp2 from
conda-forge, in order to be able to compile with the new ming2w from conda-forge. bzip2 from
[here](https://anaconda.org/conda-forge/bzip2/files/win-64/bzip2-1.0.8-h2466b09_7.conda) and zlib from
[here](https://anaconda.org/conda-forge/zlib/files/win-64/zlib-1.3.1-h2466b09_2.conda)

* introducing zlib.dll from conda forge libzlib and removing z*.lib files fixes 104

* fixing tests removing np.NaN to work with latest numpy version.
* updating zlib windows libs and h files to 1.3.1 fixes 100

* fixing bug when writing an object column filtered so that the first row has not index 0

* conda forge of 0.4.8 failed due to missing file in source distribution, adding
file to manifest and releasing again, otherwise no changes.

* Updated code to work with Cython 3.0.0, earlier versions no longer supported.
* Including dll files in pyreadr folder and putting them as package data for windows,
this solves issue 72. For unix no package data meaning no dll files but also no
.c translated files in the wheel.