[wpilib] Remove deprecated MotorControllerGroup (#8349)

wpilibc/src/main/native/cpp/motorcontrol/MotorControllerGroup.cpp

@@ -1,82 +0,0 @@
-// 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 "wpi/hardware/motor/MotorControllerGroup.hpp"
-
-#include <utility>
-#include <vector>
-
-#include "wpi/util/sendable/SendableBuilder.hpp"
-#include "wpi/util/sendable/SendableRegistry.hpp"
-
-using namespace wpi;
-
-// Can't use a delegated constructor here because of an MSVC bug.
-// https://developercommunity.visualstudio.com/content/problem/583/compiler-bug-with-delegating-a-constructor.html
-
-WPI_IGNORE_DEPRECATED
-
-MotorControllerGroup::MotorControllerGroup(
-    std::vector<std::reference_wrapper<MotorController>>&& motorControllers)
-    : m_motorControllers(std::move(motorControllers)) {
-  Initialize();
-}
-
-void MotorControllerGroup::Initialize() {
-  for (auto& motorController : m_motorControllers) {
-    wpi::util::SendableRegistry::AddChild(this, &motorController.get());
-  }
-  static int instances = 0;
-  ++instances;
-  wpi::util::SendableRegistry::Add(this, "MotorControllerGroup", instances);
-}
-
-void MotorControllerGroup::Set(double speed) {
-  for (auto motorController : m_motorControllers) {
-    motorController.get().Set(m_isInverted ? -speed : speed);
-  }
-}
-
-void MotorControllerGroup::SetVoltage(wpi::units::volt_t output) {
-  for (auto motorController : m_motorControllers) {
-    motorController.get().SetVoltage(m_isInverted ? -output : output);
-  }
-}
-
-double MotorControllerGroup::Get() const {
-  if (!m_motorControllers.empty()) {
-    return m_motorControllers.front().get().Get() * (m_isInverted ? -1 : 1);
-  }
-  return 0.0;
-}
-
-void MotorControllerGroup::SetInverted(bool isInverted) {
-  m_isInverted = isInverted;
-}
-
-bool MotorControllerGroup::GetInverted() const {
-  return m_isInverted;
-}
-
-void MotorControllerGroup::Disable() {
-  for (auto motorController : m_motorControllers) {
-    motorController.get().Disable();
-  }
-}
-
-void MotorControllerGroup::StopMotor() {
-  for (auto motorController : m_motorControllers) {
-    motorController.get().StopMotor();
-  }
-}
-
-void MotorControllerGroup::InitSendable(wpi::util::SendableBuilder& builder) {
-  builder.SetSmartDashboardType("Motor Controller");
-  builder.SetActuator(true);
-  builder.AddDoubleProperty(
-      "Value", [=, this] { return Get(); },
-      [=, this](double value) { Set(value); });
-}
-
-WPI_UNIGNORE_DEPRECATED