[wpilib] Add PS4Controller, remove Hand from GenericHID/XboxController (#3345)

- GenericHID is now concrete, and has only getRawAxis/Button(int) functionality
- getXxx() has been moved into Joystick as that's the only place where it makes sense
- Hand (and therefore getXxx(Hand)) has been removed, replaced by specific getLeft/RightXxx() methods in XboxController and the new PS4Controller class
- C++ ::Button:: and ::Axis:: enums have been converted to identically-namespaced static constexpr ints

wpilibc/src/main/native/cpp/simulation/PS4ControllerSim.cpp

@@ -0,0 +1,101 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "frc/simulation/PS4ControllerSim.h"
+
+#include "frc/PS4Controller.h"
+
+using namespace frc;
+using namespace frc::sim;
+
+PS4ControllerSim::PS4ControllerSim(const PS4Controller& joystick)
+    : GenericHIDSim{joystick} {
+  SetAxisCount(6);
+  SetButtonCount(14);
+}
+
+PS4ControllerSim::PS4ControllerSim(int port) : GenericHIDSim{port} {
+  SetAxisCount(6);
+  SetButtonCount(14);
+}
+
+void PS4ControllerSim::SetLeftX(double value) {
+  SetRawAxis(PS4Controller::Axis::kLeftX, value);
+}
+
+void PS4ControllerSim::SetRightX(double value) {
+  SetRawAxis(PS4Controller::Axis::kRightX, value);
+}
+
+void PS4ControllerSim::SetLeftY(double value) {
+  SetRawAxis(PS4Controller::Axis::kLeftY, value);
+}
+
+void PS4ControllerSim::SetRightY(double value) {
+  SetRawAxis(PS4Controller::Axis::kRightY, value);
+}
+
+void PS4ControllerSim::SetL2Axis(double value) {
+  SetRawAxis(PS4Controller::Axis::kL2, value);
+}
+
+void PS4ControllerSim::SetR2Axis(double value) {
+  SetRawAxis(PS4Controller::Axis::kR2, value);
+}
+
+void PS4ControllerSim::SetSquareButton(bool value) {
+  SetRawButton(PS4Controller::Button::kSquare, value);
+}
+
+void PS4ControllerSim::SetCrossButton(bool value) {
+  SetRawButton(PS4Controller::Button::kCross, value);
+}
+
+void PS4ControllerSim::SetCircleButton(bool value) {
+  SetRawButton(PS4Controller::Button::kCircle, value);
+}
+
+void PS4ControllerSim::SetTriangleButton(bool value) {
+  SetRawButton(PS4Controller::Button::kTriangle, value);
+}
+
+void PS4ControllerSim::SetL1Button(bool value) {
+  SetRawButton(PS4Controller::Button::kL1, value);
+}
+
+void PS4ControllerSim::SetR1Button(bool value) {
+  SetRawButton(PS4Controller::Button::kR1, value);
+}
+
+void PS4ControllerSim::SetL2Button(bool value) {
+  SetRawButton(PS4Controller::Button::kL2, value);
+}
+
+void PS4ControllerSim::SetR2Button(bool value) {
+  SetRawButton(PS4Controller::Button::kR2, value);
+}
+
+void PS4ControllerSim::SetShareButton(bool value) {
+  SetRawButton(PS4Controller::Button::kShare, value);
+}
+
+void PS4ControllerSim::SetOptionsButton(bool value) {
+  SetRawButton(PS4Controller::Button::kOptions, value);
+}
+
+void PS4ControllerSim::SetL3Button(bool value) {
+  SetRawButton(PS4Controller::Button::kL3, value);
+}
+
+void PS4ControllerSim::SetR3Button(bool value) {
+  SetRawButton(PS4Controller::Button::kR3, value);
+}
+
+void PS4ControllerSim::SetPSButton(bool value) {
+  SetRawButton(PS4Controller::Button::kPS, value);
+}
+
+void PS4ControllerSim::SetTouchpad(bool value) {
+  SetRawButton(PS4Controller::Button::kTouchpad, value);
+}