[FEATURE] Allow overriding of image manipulation cropVariants

It is not possible to change or override cropVariants via TSconfig
for sys_file_reference (e.g. for a specific user or page tree branch),
thus making the cropping functionality a pain for bigger sites.
Setting a FormEngine option as expected like
TCEFORM.sys_file_reference.crop.config.cropVariants.* does now work.

Resolves: #79812
Releases: master
Change-Id: I9d36f6661c2a5ca051b803f06485fdb4c8c8a437
Reviewed-on: https://review.typo3.org/51676


Reviewed-by: Frans Saris <franssaris@gmail.com>
Tested-by: Frans Saris <franssaris@gmail.com>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Mona Muzaffar <mona.muzaffar@gmx.de>
Reviewed-by: Jasmina Ließmann <code@frauliessmann.de>
Tested-by: Jasmina Ließmann <code@frauliessmann.de>
Reviewed-by: Helmut Hummel <typo3@helhum.io>
Tested-by: Helmut Hummel <typo3@helhum.io>