Icon Picker

[davideprevosto]

Hi, how about adding support for the Icon Picker field? I don't know if the following code would be sufficient.

# src/FieldsBuilder.php

/**
 * @param string $name
 * @param array $args field configuration
 * @throws FieldNameCollisionException if name already exists.
 * @return FieldBuilder
 */
 public function addIconPicker($name, array $args = [])
 {
      return $this->addField($name, 'icon_picker', $args);
 }