Gutenberg compatibility for "Hide on screen" settings

Description

Each field group contains a setting called "Hide on screen". This setting allows a user to select from a list of known "elements" on the page such as Permalink, Excerpt, Revisions, Format, etc.

Developers enjoy this setting as they can use it to hide core metaboxes from within the field group.

For example, you can create a field group called "Home" with some custom fields, and then hide all the WP default metaboxes (except the publish box). This makes the edit screen look highly customized with little effort.

To do this, we use CSS to hide these "elements".

Issues

• Our CSS can no longer can target these elements due to changes in the Gutenberg HTML markup. It is not possible to target a specific panel via CSS.

Questions

• How can we hide / show the following "elements"?
  Permalink
  Content Editor (not sure if this is possible now)
  Excerpt
  Discussion
  Comments
  Revisions
  Slug
  Author
  Format
  Page Attributes
  Featured Image
  Categories
  Tags
  Send Trackbacks
• Can we still achieve this via CSS, or can we use the JS API?
• These "hide on screen" settings update via the Dynamic metaboxes feature, so we need the ability to hide an "element" and then show it later.

No files or tests are named. Start by reviewing the Gutenberg editor markup and JS API, alongside the Dynamic metaboxes issue (#111), to determine how the listed elements can be identified and controlled; done means Hide on screen can hide and later show the supported elements reliably.