[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.
Reviewed-by: Christian Kuhn <email@example.com>
Tested-by: Christian Kuhn <firstname.lastname@example.org>
Reviewed-by: Benjamin Mack <email@example.com>
Tested-by: Benjamin Mack <firstname.lastname@example.org>