Refactor KeyCode into Key and Location

core/src/keyboard/location.rs

@@ -0,0 +1,12 @@
+/// The location of a key on the keyboard.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum Location {
+    /// The standard group of keys on the keyboard.
+    Standard,
+    /// The left side of the keyboard.
+    Left,
+    /// The right side of the keyboard.
+    Right,
+    /// The numpad of the keyboard.
+    Numpad,
+}