[TASK] Improve visual appearance of feature toggles

This extends and improves the visual appearance of
the feature toggle card in the settings module.

Furthermore the card now reload its content after saving.
This was not the case before and one had to close and reopen
the card to see changes made.

Resolves: #89844
Releases: master
Change-Id: I342a0719609dbd086a454bdd7f11e160284c22d6
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/63330


Tested-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Michael Schams <typo3@2018.schams.net>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Reviewed-by: Benni Mack <benni@typo3.org>