[sim] Move Sim classes from HAL to wpilibc/j (#2549)

Also move some things in HAL for consistency.

WAS:
C++:
- C APIs: #include "mockdata/AccelerometerData.h"
- User side class: #include "simulation/AccelerometerSim.h"
Java:
- JNI APIs: hal.sim.mockdata.AccelerometerData (and a few classes in hal.sim)
- User side classes: hal.sim.AccelerometerSim

IS:
C++:
- C APIs: #include "hal/simulation/AccelerometerData.h"
- C++ class: #include "frc/simulation/AccelerometerSim.h"
Java:
- JNI APIs: hal.simulation.AccelerometerData
- User side class: wpilibj.simulation.AccelerometerSim

wpilibc/src/main/native/include/frc/simulation/PWMSim.h

@@ -0,0 +1,115 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
+/* Open Source Software - may be modified and shared by FRC teams. The code   */
+/* must be accompanied by the FIRST BSD license file in the root directory of */
+/* the project.                                                               */
+/*----------------------------------------------------------------------------*/
+
+#pragma once
+
+#include <memory>
+#include <utility>
+
+#include <hal/simulation/PWMData.h>
+
+#include "CallbackStore.h"
+
+namespace frc {
+namespace sim {
+class PWMSim {
+ public:
+  explicit PWMSim(int index) { m_index = index; }
+
+  std::unique_ptr<CallbackStore> RegisterInitializedCallback(
+      NotifyCallback callback, bool initialNotify) {
+    auto store = std::make_unique<CallbackStore>(
+        m_index, -1, callback, &HALSIM_CancelPWMInitializedCallback);
+    store->SetUid(HALSIM_RegisterPWMInitializedCallback(
+        m_index, &CallbackStoreThunk, store.get(), initialNotify));
+    return store;
+  }
+
+  bool GetInitialized() const { return HALSIM_GetPWMInitialized(m_index); }
+
+  void SetInitialized(bool initialized) {
+    HALSIM_SetPWMInitialized(m_index, initialized);
+  }
+
+  std::unique_ptr<CallbackStore> RegisterRawValueCallback(
+      NotifyCallback callback, bool initialNotify) {
+    auto store = std::make_unique<CallbackStore>(
+        m_index, -1, callback, &HALSIM_CancelPWMRawValueCallback);
+    store->SetUid(HALSIM_RegisterPWMRawValueCallback(
+        m_index, &CallbackStoreThunk, store.get(), initialNotify));
+    return store;
+  }
+
+  int GetRawValue() const { return HALSIM_GetPWMRawValue(m_index); }
+
+  void SetRawValue(int rawValue) { HALSIM_SetPWMRawValue(m_index, rawValue); }
+
+  std::unique_ptr<CallbackStore> RegisterSpeedCallback(NotifyCallback callback,
+                                                       bool initialNotify) {
+    auto store = std::make_unique<CallbackStore>(
+        m_index, -1, callback, &HALSIM_CancelPWMSpeedCallback);
+    store->SetUid(HALSIM_RegisterPWMSpeedCallback(m_index, &CallbackStoreThunk,
+                                                  store.get(), initialNotify));
+    return store;
+  }
+
+  double GetSpeed() const { return HALSIM_GetPWMSpeed(m_index); }
+
+  void SetSpeed(double speed) { HALSIM_SetPWMSpeed(m_index, speed); }
+
+  std::unique_ptr<CallbackStore> RegisterPositionCallback(
+      NotifyCallback callback, bool initialNotify) {
+    auto store = std::make_unique<CallbackStore>(
+        m_index, -1, callback, &HALSIM_CancelPWMPositionCallback);
+    store->SetUid(HALSIM_RegisterPWMPositionCallback(
+        m_index, &CallbackStoreThunk, store.get(), initialNotify));
+    return store;
+  }
+
+  double GetPosition() const { return HALSIM_GetPWMPosition(m_index); }
+
+  void SetPosition(double position) {
+    HALSIM_SetPWMPosition(m_index, position);
+  }
+
+  std::unique_ptr<CallbackStore> RegisterPeriodScaleCallback(
+      NotifyCallback callback, bool initialNotify) {
+    auto store = std::make_unique<CallbackStore>(
+        m_index, -1, callback, &HALSIM_CancelPWMPeriodScaleCallback);
+    store->SetUid(HALSIM_RegisterPWMPeriodScaleCallback(
+        m_index, &CallbackStoreThunk, store.get(), initialNotify));
+    return store;
+  }
+
+  int GetPeriodScale() const { return HALSIM_GetPWMPeriodScale(m_index); }
+
+  void SetPeriodScale(int periodScale) {
+    HALSIM_SetPWMPeriodScale(m_index, periodScale);
+  }
+
+  std::unique_ptr<CallbackStore> RegisterZeroLatchCallback(
+      NotifyCallback callback, bool initialNotify) {
+    auto store = std::make_unique<CallbackStore>(
+        m_index, -1, callback, &HALSIM_CancelPWMZeroLatchCallback);
+    store->SetUid(HALSIM_RegisterPWMZeroLatchCallback(
+        m_index, &CallbackStoreThunk, store.get(), initialNotify));
+    return store;
+  }
+
+  bool GetZeroLatch() const { return HALSIM_GetPWMZeroLatch(m_index); }
+
+  void SetZeroLatch(bool zeroLatch) {
+    HALSIM_SetPWMZeroLatch(m_index, zeroLatch);
+  }
+
+  void ResetData() { HALSIM_ResetPWMData(m_index); }
+
+ private:
+  int m_index;
+};
+}  // namespace sim
+}  // namespace frc