Add support for the icon picker field type

The Icon Picker was added in ACF 6.3. Current version of ACF is 6.3.2

### Requirements

Support display of icons that have been picked using the Icon Picker

### Proposed solution

- See https://www.advancedcustomfields.com/resources/icon-picker/
- Also test all field types with ACF 6.3.2, WordPress 6.5.5 ( or higher ) and PHP 8.3
