This is another refactoring in the multi-step process to remove all uses
of our custom Render Buffer.
Previous commit: bb31e7f5b6 in the series.
This commit affects the display of the Webhooks Deliver Status column. It
is just a refactor and does not change any functionality.
- adds a migration renaming FA4 icon names in badges
- allows all icons to be used in badges (previously was limited to icons prefixed with fa-)
- renames remaining FA 4.7 icons equivalents
