Move reusable mouse types to iced_core

native/src/input/mouse/button.rs

@@ -1,15 +0,0 @@
-/// The button of a mouse.
-#[derive(Debug, Hash, PartialEq, Eq, Clone, Copy)]
-pub enum Button {
-    /// The left mouse button.
-    Left,
-
-    /// The right mouse button.
-    Right,
-
-    /// The middle (wheel) button.
-    Middle,
-
-    /// Some other button.
-    Other(u8),
-}