Cgohlke

- Deprecate support for Python 3.6 (NEP 29).
- Move pyramidal subresolution series to TiffPageSeries.levels (breaking).
- Add parser for SVS, SCN, NDPI, and QPI pyramidal series.
- Read single-file OME-TIFF pyramids.
- Read NDPI files > 4 GB (15).
- Include SubIFDs in generic series.
- Preliminary support for writing packed integer arrays (11, WIP).
- Read more LSM info subrecords.
- Fix missing ReferenceBlackWhite tag for YCbCr photometrics.
- Fix reading lossless JPEG compressed DNG files.

- Support os.PathLike file names (9).

- Re-add pure Python PackBits decoder.

- Fix int32 to hex color conversion.
- Fix coordinates of closing path.
- Fix reading TIFF files with no overlays.

- Make imagecodecs an optional dependency again.
- Disable multi-threaded decoding of small LZW compressed segments.
- Fix caching of TiffPage.decode method.
- Fix xml.etree.cElementTree ImportError on Python 3.9.
- Fix tostring DeprecationWarning.

- Fix reading ImageJ grayscale mode RGB images (6).
- Remove napari reader plugin.