[BUGFIX] dce:image-ViewHelper does not support "treatIdAsReference"

Add option treatIdAsReference to viewhelper. Correct FAQ in documentation.

Resolves: #59840
Change-Id: Iff5cdb4077b64e41a41f5d9f799e9ff599a3f3f7
Reviewed-on: https://review.typo3.org/31108
Reviewed-by: Armin Ruediger Vieweg
Tested-by: Armin Ruediger Vieweg