A Sortable field can be inserted in:
- an Admin Page, as an option or a user_meta
- a User Profile, as a user_meta
- a Metabox, as a post_meta

The code below is used to generate this section in an Admin Page, for an option:
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A Sortable inherit from a Field, and an Item, then all settings described in Field Settings and Item Settings are also used.
Specific settings for Sortable:
| Sortable Settings | Description | 
|---|---|
| options array / Default: array() | Associative array of value-label pairs containing option | 
| visible_button boolean / Default: true | Set to true to see buttons | 
