This patch has 2 new features:
1- new option at constructor to enable creation of detached toolbar from
his parent, this enable the use of toolbar anywhere and the size can be
controlled by a layout manager.
2- add a new option in order to enable to place buttons at right part,
the widget has a new method go_right() after calling it, every new
button is right aligned.
Both changes don't break compatibility with old code.