npe2 0.1.0

proposal for napari plugin refactor

npe2

napari plugin refactor

see also https://github.com/napari/napari/issues/3115

Includes a command line tool npe2 with the following commands:

Commands:
  convert   Convert existing plugin to new manifest.
  parse     Show parsed manifest as yaml
  validate  Validate manifest for a distribution name or manifest filepath.

examples:

# create npe2 manifest from first-generation napari plugin
npe2 convert your-plugin-package --out napari.yaml

npe2 validate your-plugin-package

npe2 parse your-plugin-package