Changes from 2.16.0 to 2.17.0

New b2nd_copy_buffer2() function for copying buffers with typesizes
larger than 255. The previous b2nd_copy_buffer() function is now
deprecated and will be removed in a future release.
Support repeated values larger than 8-bit, also for n-dim arrays.
This is useful for compressing arrays with large runs of repeated
values, like in the case of images with large areas of the same color.
Fix a leak in the pthreads emulation for Windows. Fixes #647.
Thanks to @jocbeh for the report and fix (#655).
Update zstd to 1.5.7. Thanks to Tom Birch.
Add BLOSC2_MAXTYPESIZE constant.

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