[BUGFIX] FormEngine gaps, sections and borders

* Padding & margins
* Section headline
* First section border top
* Hover link (everywhere)

Resolves: #62999
Releases: master
Change-Id: Ib617cf01644b2d11e022f4e318a745961ddd8860
Reviewed-on: http://review.typo3.org/34223
Tested-by: Benjamin Mack <benni@typo3.org>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>