* Start of basic scrollbar drawing. This will be improved. Only Outliner shows these for now, as although the Timeline should show them, the old files didn't have them turned on. * Tidied up the view-panning operator - Fixed naming convention - Added user-adjustable properties (deltax, deltay in screenspace) * Added ctrl-scrollwheel (horizontal) and shift-scrollwheel (vertical) scroll operators. These use the view-panning code too. Unfortunately, I haven't been able to figure out why the WHEELMOUSEDOWN events don't seem to be triggering the operators!