Added button-close-hover style variant #5
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In order to simplify the creation of a customized titlebar for the Sun Valley theme, I added a Close Button style that highlights in red on hover.
Changes:
Added button-close-hover.png (red background version of button-hover) for light and dark themes
Modified dark.tcl and light.tcl to include Close.TButton style. Use this button in the same way as Accent.TButton.