Feature: #69389 - Add spinning feature for icon

See Issue #69389

Description

The Icon API has now a support for spinning icons. While registering an icon a new property spinning is available:

$iconRegistry = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(\TYPO3\CMS\Core\Imaging\IconRegistry::class);
$iconRegistry->registerIcon(
        'my-spinning-icon',
        \TYPO3\CMS\Core\Imaging\IconProvider\FontawesomeIconProvider::class,
        array(
                'name' => 'times',
                'spinning' => TRUE
        )
);

Impact

Icons can now be animated.