Move implementations from example to libcosmic

src/widget/mod.rs

@@ -0,0 +1,22 @@
+#[macro_export]
+macro_rules! button {
+    ($($x:expr),+ $(,)?) => (
+        $crate::iced::widget::Button::new(
+            $crate::iced::widget::Row::with_children(
+                vec![$($crate::iced::Element::from($x)),+]
+            )
+            .spacing(8)
+        )
+        .padding([8, 16])
+    );
+}
+pub use button;
+
+mod icon;
+pub use self::icon::icon;
+
+mod list_view;
+pub use list_view::list_view_style;
+
+mod nav_bar;
+pub use nav_bar::nav_bar_style;