[FEATURE] Refactor toolbar / topbar HTML5 & layout

First step for Toolbar/Topbar refactoring. This is a first step
to refactor HTML5 output - the path to gain HTML5 viewport
without ExtJS and based on jQuery and Bootstrap.

Migrates HTML from topbar to .navbar - keeps ids.
Makes use of .dropdown and .dropdown-menu.
Therefore removes duplicated CSS.
Also increase size to fit our fingers & touch.

This issue is not breaking since common css classes
and interfaces are kept.

Next step #62166: introduce "ToolbarItemInterface" and
remove toolbar-item css and layouts.

Resolves: #62481
Related: #62166
Releases: master
Change-Id: I8c215b19da4a99ad81e53b000b281849991d8deb
Reviewed-on: http://review.typo3.org/33564
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Benjamin Mack <benni@typo3.org>
Tested-by: Benjamin Mack <benni@typo3.org>