JPEG-2000 compression based refactoring

[chris-allan]

Refactors the codebase such that all compression is performed by imagecodecs using a JPEG-2000 codec for Zarr.

NOTE: Due to the Python 3.7+ requirements of some of the dependencies used in this PR and the availability of the iSyntax SDK for Python 3.7 currently being restricted to Windows it will only run on that platform.

This PR can be executed as regular isyntax2raw with the exception of the --psnr command line option. NOTE: This option is fed directly into imagecodecs and may need to be inversed depending on the version installed (--psnr=60 being equivalent to 40 PSNR). For example:

isyntax2raw write_tiles --psnr 60 --max_workers 8 1.isyntax 1.zarr

Testing of the result can be performed on the same platform and Python environemnt with napari; assuming 1.isyntax has been converted to 1.zarr as above. For example:

import isyntax2raw
import napari
with napari.gui_qt():
    viewer = napari.Viewer()
    viewer.open('path\\to\\1.zarr\\0')

This testing with napari can happen on any platform with Python 3.7+ utilizing the JPEG-2000 Codec factored out and published to PyPI as zarr-jpeg2k:

import zarr_jpeg2k
import napari
with napari.gui_qt():
    viewer = napari.Viewer()
    viewer.open('path\\to\\1.zarr\\0')

Latest wheel:

• https://ci.appveyor.com/api/buildjobs/ht940448ceucq3rr/artifacts/dist%2Fisyntax2raw-0.4.0.post21.dev173556795-py3-none-any.whl