Replace Tabbar with a Scopebar

.. Only tested on Linux

.. Now going to check on Mac and Qt5

.. Also does not yet support re-ordering tabs
   nor scrolling when there are too many to show.
   This will come in future updates.
Fix Scope/ChartBar Font Size on Windows

.. it was size 8 for some bizarre reason
TabBar to ScopeBar Mac Fixups

.. using QtMacButton not GcScopeButton
Merge commit '1b682030462a462b32af0d9c0619f7429748c519'