adding support for Clear key on mac added in libnut fa2b880: nut-tree/libnut-core@fa2b880 (#520)

Author: smithkyle

lib/key.enum.ts

@@ -113,6 +113,7 @@ export enum Key {
   Divide,
   Decimal,
   Enter,
+  Clear,
 
   NumPad0,
   NumPad1,

lib/provider/native/libnut-keyboard.class.ts

@@ -131,6 +131,7 @@ export default class KeyboardAction implements KeyboardProviderInterface {
     [Key.Multiply, "multiply"],
     [Key.Divide, "divide"],
     [Key.Enter, "enter"],
+    [Key.Clear, "clear"],
 
     [Key.CapsLock, "caps_lock"],
     [Key.ScrollLock, "scroll_lock"],