Bump napari to 0.5.0 and updated ultrack to use plugin menus

[JoOkuma]

More info about plugin menus: https://napari.org/dev/naps/6-contributable-menus.html

Example of refactoring: jni/affinder#96

[ilan-theodoro]

I have a few questions. Currently, we have a list of six commands in the plugins menu:

• Main widget
• Labels to edges map
• Segmentation hypothesis visualization
• Node annotation
• Division annotation
• Track inspection

How would they be categorized? Will all of them be on the contributable menu? Is the following assignment okay?

• napari/layers/track
• napari/layers/filter
• napari/layers/visualize
• napari/layers/annotate
• napari/layers/annotate
• napari/layers/visualize

[ilan-theodoro]

@JoOkuma

[JoOkuma]

@ilan-theodoro, lets wait for #130 to be merged

[JoOkuma]

Since we merged #130 this can be done, @ilan-theodoro

I wouldn't include the auxiliary / deprecated widgets because they are not well maintained.
I think a PR to fix this would just put UltrackWidget in the tracking category of the plugin menus.