handle different dpi and scaling changes correctly on windows and mac
fix null pointer exception
create new class ColorSchemeGraphicsView and move much code into it
add new ColorSchemeGraphicsItemGroup; implement selection of presets with keyboard
consider hidden colorschemes on keyboard selection; fix colorscheme item frame rect on retina macs
resize ColorSchemeGraphicsView based on number of classes; add margin to ensureVisible call
revert back to 5 classes as default
add DpiAwareGraphicsView
move ColorSchemeGraphicsView out of API
Add preview
small fix
add hex color values to color scheme preview tooltips
Merge pull request #26 from hpicgs/color_scheme_presets_widget_improvements

Color scheme presets widget improvements