Breaking: #69561 - Replace sprite icons with IconFactory in ContextMenu 

See forge#69561

Description 

SpriteIcon and standalone image support have been replaced with IconFactory in the context menu. All menu icons now need to be registered through the IconRegistry.

Impact 

The UserTsConfig options for items icon and spriteIcon have no effect anymore, and will deliver a blank placeholder image if iconName is not set.

Affected Installations 

All installations that add or modify items in the ContextMenu.

Migration 

Register the icon through the IconRegistry and set the iconName in the item configuration.

// Register Icon
$iconRegistry = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(\TYPO3\CMS\Core\Imaging\IconRegistry::class);
$iconRegistry->registerIcon(
	'contextmenu-example',
	\TYPO3\CMS\Core\Imaging\IconProvider\SvgIconProvider::class,
	array(
		'source' => 'EXT:example/Resources/Public/Icons/contextmenu-example.svg'
	))
);
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options.contextMenu.table {
	virtual_root.items {
		9999 = ITEM
		9999 {
			name = contextmenuExample
			label = LLL:EXT:example/Resources/Private/Language/locallang.xlf:contextmenu-example
			iconName = contextmenu-example
			callbackAction = exampleCallback
		}
	}
}
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