Add native block-editor support

Merged Erick Hitter requested to merge add/gutenberg-control into master
  • Add wp-scripts for build
  • Enqueue script, excluding it from widget block editor
  • Localize script with configurable/filterable options
  • Localize script with titles for post types to match current functionality
  • Register meta and set sanitization callbacks
  • Allow meta to be accessed via endpoint
  • Create sidebar plugin to show the two fields used by the plugin
Edited by Erick Hitter

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