Significantly improved the layout consistency when enlarging the device scale.
Created a DeviceMargin and DevicePadding on GuiWidget
Deleted dead code
Made many images have default larger disk sizes and scale in memory.
Made the menus have horizontal spacers rather than dashed lines
Added DynamicDropDownMenu( can add to drop down via .add method)
DropDownMenuWidget (made drawDirectionalArrow virtual)
Added Factory for DropDownMenu and Split Button
Add/used Factories in View3DWidget
