[TASK] Add TYPO3 v12 support and remove support for < v10 #16
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This change cleans up legacy handling for
TYPO3 versions below v10 LTS.
In addition, v12 support was added by migrating
the backend preview to a ES6 module and
the new v12 format (label/icon/value instead of 0,1,2).
The hook 'tt_content_drawFooter' and its addition
still does not work with TYPO3 v12 as the hook has been removed.