[TASK] FlexForms: Replace scripactulous with jQuery UI

Sorting of flexforms (e.g. media element)
is done with scriptaculous. The jQuery UI
sortable functionality is a drop-in replacement
already in use for IRRE sorting.

The patch replaces the scriptaculous code
with jQuery UI sortable.

Releases: master
Resolves: #62985
Change-Id: I8655cd2cc0004dc366ebb77b31f5e686dedaf74a
Reviewed-on: http://review.typo3.org/34206
Reviewed-by: Sebastian Fischer <typo3@evoweb.de>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>
Tested-by: Oliver Hader <oliver.hader@typo3.org>