[TASK] Refactor formengine required handling

This patch removes the required images and adds CSS based styling
for required fields and minitems/maxitems validation.

Resolves: #67354
Releases: master
Change-Id: I5dbccb1c84035fa21079b09748c767bc4f3d06d0
Reviewed-on: http://review.typo3.org/39302


Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Frank Nägler <frank.naegler@typo3.org>
Tested-by: Frank Nägler <frank.naegler@typo3.org>