[TASK] EXT:scheduler:action icons and sorting

In order to be consistent, add action icons
and sort multi action buttons according to the single action.

Resolves: #81080
Releases: master, 8.7
Change-Id: If987643eaea17ed98722b933fc8c57818e7a7a93
Reviewed-on: https://review.typo3.org/52661


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Sascha Egerer <sascha@sascha-egerer.de>
Tested-by: Sascha Egerer <sascha@sascha-egerer.de>
Reviewed-by: Henrik Elsner <helsner@dfau.de>
Tested-by: Henrik Elsner <helsner@dfau.de>
Reviewed-by: Elmar Hinz <t3elmar@gmail.com>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>