Add new bevel effect to window title

ChangeLog

src/frame.c

src/settings.c

src/settings.h

themes/daloa/close-active.xpm

themes/daloa/close-pressed.xpm

themes/daloa/hide-active.xpm

themes/daloa/hide-pressed.xpm

themes/daloa/maximize-active.xpm

themes/daloa/maximize-pressed.xpm

themes/daloa/maximize-toggled-active.xpm

themes/daloa/maximize-toggled-pressed.xpm

themes/daloa/shade-active.xpm

themes/daloa/shade-pressed.xpm

themes/daloa/shade-toggled-active.xpm

themes/daloa/shade-toggled-pressed.xpm

themes/daloa/stick-active.xpm

themes/daloa/stick-pressed.xpm

themes/daloa/stick-toggled-active.xpm

themes/daloa/stick-toggled-pressed.xpm