[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/PDPSim.h

@@ -0,0 +1,97 @@
+/*----------------------------------------------------------------------------*/
+/* 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/PDPData.h>
+
+#include "CallbackStore.h"
+
+namespace frc {
+namespace sim {
+class PDPSim {
+ public:
+  explicit PDPSim(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_CancelPDPInitializedCallback);
+    store->SetUid(HALSIM_RegisterPDPInitializedCallback(
+        m_index, &CallbackStoreThunk, store.get(), initialNotify));
+    return store;
+  }
+
+  bool GetInitialized() const { return HALSIM_GetPDPInitialized(m_index); }
+
+  void SetInitialized(bool initialized) {
+    HALSIM_SetPDPInitialized(m_index, initialized);
+  }
+
+  std::unique_ptr<CallbackStore> RegisterTemperatureCallback(
+      NotifyCallback callback, bool initialNotify) {
+    auto store = std::make_unique<CallbackStore>(
+        m_index, -1, callback, &HALSIM_CancelPDPTemperatureCallback);
+    store->SetUid(HALSIM_RegisterPDPTemperatureCallback(
+        m_index, &CallbackStoreThunk, store.get(), initialNotify));
+    return store;
+  }
+
+  double GetTemperature() const { return HALSIM_GetPDPTemperature(m_index); }
+
+  void SetTemperature(double temperature) {
+    HALSIM_SetPDPTemperature(m_index, temperature);
+  }
+
+  std::unique_ptr<CallbackStore> RegisterVoltageCallback(
+      NotifyCallback callback, bool initialNotify) {
+    auto store = std::make_unique<CallbackStore>(
+        m_index, -1, callback, &HALSIM_CancelPDPVoltageCallback);
+    store->SetUid(HALSIM_RegisterPDPVoltageCallback(
+        m_index, &CallbackStoreThunk, store.get(), initialNotify));
+    return store;
+  }
+
+  double GetVoltage() const { return HALSIM_GetPDPVoltage(m_index); }
+
+  void SetVoltage(double voltage) { HALSIM_SetPDPVoltage(m_index, voltage); }
+
+  std::unique_ptr<CallbackStore> RegisterCurrentCallback(
+      int channel, NotifyCallback callback, bool initialNotify) {
+    auto store = std::make_unique<CallbackStore>(
+        m_index, channel, -1, callback, &HALSIM_CancelPDPCurrentCallback);
+    store->SetUid(HALSIM_RegisterPDPCurrentCallback(
+        m_index, channel, &CallbackStoreThunk, store.get(), initialNotify));
+    return store;
+  }
+
+  double GetCurrent(int channel) const {
+    return HALSIM_GetPDPCurrent(m_index, channel);
+  }
+
+  void SetCurrent(int channel, double current) {
+    HALSIM_SetPDPCurrent(m_index, channel, current);
+  }
+
+  void GetAllCurrents(double* currents) {
+    HALSIM_GetPDPAllCurrents(m_index, currents);
+  }
+
+  void SetAllCurrents(const double* currents) {
+    HALSIM_SetPDPAllCurrents(m_index, currents);
+  }
+
+  void ResetData() { HALSIM_ResetPDPData(m_index); }
+
+ private:
+  int m_index;
+};
+}  // namespace sim
+}  // namespace frc