[TASK] Simplify TypoScript Info Module

The Info/Modify module currently handles the saving of
some fields on its own. Use the FormEngine for the
fields title, sitetitle and description.

This makes the UI also nicer.

The fields config/constants are kept, also because
of the t3editor support.

Resolves: #62802
Releases: master
Change-Id: I29c6ffaea07030804a7f82038233f3d3450f7630
Reviewed-on: http://review.typo3.org/33933
Reviewed-by: Stefan Froemken <froemken@gmail.com>
Tested-by: Stefan Froemken <froemken@gmail.com>
Reviewed-by: Felix Kopp <felix-source@phorax.com>
Tested-by: Felix Kopp <felix-source@phorax.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>