Cleanup builds

[joshmoore]

After the extraction of the napari plugin to napari-ome-zarr,
a number of the matrix builds can be eliminated. This PR attempts
to drop any dependencies on Qt-related code which should all be in
the plugin repository.

[joshmoore]

@will-moore : in order to get rid of the vispy dependency, can you see just adding these values raw rather than wrapping them with a Colormap?

                color = ch.get("color", None)
                if color is not None:
                    rgb = [(int(color[i : i + 2], 16) / 255) for i in range(0, 6, 2)]
                    # TODO: make this value an enumeration
                    if model == "greyscale":
                        rgb = [1, 1, 1]
                    colormaps.append(Colormap([[0, 0, 0], rgb]))

[will-moore]

A Colormap was added here because that's what napari was expecting.

It looks like napari is still expecting a napari colormap in add_image: https://napari.org/docs/0.4.7/api/napari.Viewer.html#napari.Viewer.add_image but this won't be needed
now that napari support is moved to napari-ome-zarr.

[joshmoore]

So store [[0, 0, 0], rgb] and then transform in napari-ome-zarr? Or introduce an object here?

[will-moore]

I would think that [[0, 0, 0], rgb] would be fine, but happy to use an Object if it's clearer etc.

[codecov]

Codecov Report

Merging #91 (d79c393) into master (68aca49) will increase coverage by 2.18%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #91      +/-   ##
==========================================
+ Coverage   67.18%   69.37%   +2.18%     
==========================================
  Files          10       11       +1     
  Lines         963     1035      +72     
==========================================
+ Hits          647      718      +71     
- Misses        316      317       +1     

Impacted Files	Coverage Δ
ome_zarr/reader.py	58.16% <ø> (-0.22%)	⬇️
ome_zarr/utils.py	90.80% <0.00%> (-0.77%)	⬇️
ome_zarr/format.py	94.11% <0.00%> (ø)
ome_zarr/data.py	98.70% <0.00%> (+0.01%)	⬆️
ome_zarr/cli.py	88.60% <0.00%> (+0.14%)	⬆️
ome_zarr/writer.py	93.93% <0.00%> (+0.18%)	⬆️
ome_zarr/io.py	82.14% <0.00%> (+3.38%)	⬆️

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[joshmoore]

Failure is caused by the recently merged zarr-developers/zarr-python#781

Edit: fixed zarr's mainline.

[constantinpape]

@joshmoore this looks good. Could we merge this now and then merge main into #89 in order to simplify the tests?

[joshmoore]

Yeah, let's do that. Then we can build up our confidence in this a bit more in this PR before cutting a release.