feat: SVG styling with icon fill color

style/src/svg.rs

@@ -0,0 +1,21 @@
+//! Change the appearance of a svg.
+
+use iced_core::Color;
+
+/// The appearance of a svg.
+#[derive(Debug, Default, Clone, Copy)]
+pub struct Appearance {
+    /// Changes the fill color
+    ///
+    /// Useful for coloring a symbolic icon.
+    pub fill: Option<Color>,
+}
+
+/// The stylesheet of a svg.
+pub trait StyleSheet {
+    /// The supported style of the [`StyleSheet`].
+    type Style: Default + Copy;
+
+    /// Produces the [`Appearance`] of the svg.
+    fn appearance(&self, style: Self::Style) -> Appearance;
+}