Add scrollbars/slider groove and 'sunken' appearance options.
Make squared scrollview appearance consistent when round is set to none.
Fix missing pixels in squred progressbars with inverted gradient.
* Added new soft and harsh gradients.
* Change defaults:
      Soft gradient
      Fade menuitems
      Don't use highlight for menu.
      Default highlight set to 3%
      Toolbar separators set to sunken
      Flat menubar appearance
      Button like check/radios
      Supply, and use, predefined custom shades
Colour all gradient type selected tabs - if option is set.
Only save appearance settings if different from default.
Modify defaults:
   Plain progress
   Don't highlight active tab
Modify defaults:
  Round slider
  Sunken scrollviews
  Sunken appearance set to soft
Fix Firefox/OO.o menu text when useHighlightForMenu is set to false.
Use faded lines for combo separator.
If a gradient does not define the values for positions 0 and 100, then
add these.
Change drawLightBevel to improve extra rounded widgets
Fix plastik mouse over
More extra-round fixes
More extra round fixes
Fix menuitem borders
* Better colouring of selected tab.
* Added new focus option - line.
Add new round options - extra and max.
Fix scrollbar groove under firefox
Fix crash when drawing focus - occurs when using alt-tab in xfwm4