- Add plugin outlet to `AdminUserFieldItem`
- Add ability to include custom fields when saving `AdminUserFieldItem`
- Update plugin API with `includeUserFieldPropertiesOnSave` per ☝️
- Add `DiscoursePluginRegistry` to `UserFieldsController` to add custom columns
1. Use `this.` instead of `{{action}}` where applicable
2. Use `{{fn}}` instead of `@actionParam` where applicable
3. Use non-`@` versions of class/type/tabindex/aria-controls/aria-expanded
4. Remove `btn` class (it's added automatically to all DButtons)
5. Remove `type="button"` (it's the default)
6. Use `concat-class` helper
In this commit 2.5 years ago, variables for showOnUserCard and showOnProfile were removed, but we still used them in the component. e29605b
This corrects the variable names and adds a test to confirm the text is now shown.
