[TASK] Port toolbar dropdowns to Fluid

The toolbar dropdown menus are ported to Fluid. Also, some small
improvements are made in this patch.

Resolves: #67537
Related: #67568
Releases: master
Change-Id: I41b502e97108494bf6d4acfa0dedb32bb18a5e18
Reviewed-on: http://review.typo3.org/40329


Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>