[TASK] Add a "save and new" button in scheduler module

Resolves: #57733
Releases: 6.3, 6.2
Change-Id: I57bd5e842374853a62a5c1e4b419c193837ccb6e
Reviewed-on: http://review.typo3.org/32798
Reviewed-by: Markus Klein <klein.t3@reelworx.at>
Tested-by: Markus Klein <klein.t3@reelworx.at>