[commands] Replace Command HID inheritance with delegation (#4470)

wpilibNewCommands/src/main/native/include/frc2/command/button/CommandXboxController.h

@@ -19,6 +19,19 @@ class CommandXboxController : public frc::XboxController {
  public:
   using XboxController::XboxController;
 
+  /**
+   * Constructs an event instance around this button's digital signal.
+   *
+   * @param button the button index
+   * @param loop the event loop instance to attach the event to. Defaults to the
+   * CommandScheduler's default loop.
+   * @return an event instance representing the button's digital signal attached
+   * to the given loop.
+   */
+  Trigger Button(int button,
+                 frc::EventLoop* loop = CommandScheduler::GetInstance()
+                                            .GetDefaultButtonLoop()) const;
+
   /**
    * Constructs an event instance around the left bumper's digital signal.
    *