[FEATURE] Group-work for HTML5 [x] checkbox-label-groups

Kick-Off patch to bring semantic HTML5 for checkbox+label groups
in the backend. Bootstrap compatible HTML5 mark-up for improved
semantics.

Adapts Web>Page and Web>List and Tools>Config.

Resolves: #61577
Releases: master
Change-Id: Ia0f030a3e3970462390563722d51f0bb0d4eb4de
Reviewed-on: http://review.typo3.org/32762
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Frank Nägler <typo3@naegler.net>
Tested-by: Frank Nägler <typo3@naegler.net>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>