Add a fonts property to the style that allows you to set fonts per control, similarily to what we do in QQuickTheme. The fonts are propagated from the style to the theme, and from the fallback style to the style. That means that if a font is not set for a theme or style, it will be resolved against its fallback font. Since both the QQStyleKitTheme and QQStyleKitStyle should have a fonts property, introduce a common base class: QQStyleKitThemeProperties that contains the fonts property. Later, the palettes can be moved there as well. Also add a font property to the QQStyleKitReader that is suposed to return the font for the current control being read. Change-Id: I116c1ab9bc426570756476ee409513587c475a0d Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@qt.io>