[TASK] Use panels for "Template" configuration

Use panel-* classes from Twitter Bootstrap
to give a better look and feel when browsing
the typoscript tree

Resolves: #63524
Releases: master
Change-Id: I999cd22a28836f2c1519c1a1d1bf66d18dda8e55
Reviewed-on: http://review.typo3.org/34945
Reviewed-by: Markus Klein <klein.t3@reelworx.at>
Tested-by: Markus Klein <klein.t3@reelworx.at>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>