Drop color key

[will-moore]

See ome/ome-zarr-py#389 cc @jni

This combines the version check for napari from that PR, along with @psobolewskiPhD's change.

Test viewing an image with labels (label colours are preserved) with napari 0.5.0 and with napari 0.4.x

E.g. red labels in

$ napari --plugin napari-ome-zarr https://uk1s3.embassy.ebi.ac.uk/idr/zarr/v0.4/idr0076A/10501752.zarr

[will-moore]

Test fixes included handling the metadata change from name to channel_names in ome/ome-zarr-py@cae02c8

The other failure was new with napari v0.5.0:

  >       viewer.window.qt_viewer.on_draw(None)
  E       AttributeError: 'QtViewer' object has no attribute 'on_draw'

I couldn't find what the correct method was to use instead of on_draw.
This also produces a warning:

FutureWarning: Public access to Window.qt_viewer is deprecated and will be removed in
  v0.6.0. It is considered an "implementation detail" of the napari
  application, not part of the napari viewer model. If your use case
  requires access to qt_viewer, please open an issue to discuss.

so it looks like this testing strategy won't be available soon anyway. My try/except AttributeError should handle both cases.

cc @joshmoore

[joshmoore]

@jni: https://pypi.org/project/napari-ome-zarr/0.6.1/ (0.6.0 failed for GH action reasons)

[jni]

(0.6.0 failed for GH action reasons)

[psobolewskiPhD]

Sorry to be late to this, but it works perfectly on my end. ❤️

[joshmoore]

Thanks, all!