Move the parse context switcher and the additional preprocessor dialog
button to the left. Thus, the new order is:

        ...
        minimized info bar buttons (not always there)
        additional preprocessor directives button ('#')
        parse context switcher (not always there)
        outline widget
        ...

This is better for splits and makes logically also more sense since the
outline widget depends on the additional preprocessor directives and/or
the parse context.

Change-Id: I3378885a44938072e6a496ce1573d1675499c498
Reviewed-by: Christian Stenger <christian.stenger@qt.io>
Reviewed-by: David Schulz <david.schulz@qt.io>