Put a button on the scope bar to add a chart. This is more
intuitive than the right click menu. The style could be
better but ok for now.
Deprecated the right-click menu option since it is unintuitive
and hidden from the user (i.e. bad UX).
There is now a little button to show and hide the sidebar
just like in Mac Mail. We now only have to add the add chart
button for the toolbar/scope bar changes to be complete.
Added a scope bar for native mac. The windows and linux
toolbar is a combined toolbar and scope bar, on a Mac it
looks much more elegant to split the two.
We will need to now add a show/hide sidebar control on the
left of the scopebar (like apple mail), the train view controls
in the centre and the add chart to the far right).
