Deprecation: #70477 - Deprecate SpriteIcon classes 

See forge#70477

Description 

The following classes have been marked as deprecated.

\TYPO3\CMS\Backend\Sprite\AbstractSpriteHandler
\TYPO3\CMS\Backend\Sprite\SimpleSpriteHandler
\TYPO3\CMS\Backend\Sprite\SpriteBuildingHandler
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Impact 

Any usage of these classes will trigger a deprecation log entry.

Affected Installations 

Extensions that use these PHP classes.

Migration 

Use the IconRegistry to register icons.