misc optional args

Optional Generic Args

These can be used on most fields.

• desc (string) Field description. Displayed below label.
• repeatable (bool) see Repeatable Fields
• repeatable_max (int) Use with repeatable to limit number of fields that can be created. see Repeatable Fields
• readonly (bool) Prevent authors editing this field value.
• default (string) Set a default value
• cols (int) [1-12] Width in columns; CMB uses a grid of 12 columns.
• sortable (bool) allow repeated fields to have their order changed.