SPI and I2C simulator (#662)

* Creating SPI and I2C simulation abilities

* Update the callback helpers to support different function callback
types
* Create callback type that uses a buffer
* Created I2C/SPI data classes that manage the callbacks and don't do
much of anything else

* Ran format, cleaned up some issues

hal/src/main/native/sim/MockData/I2CDataInternal.h

@@ -0,0 +1,50 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) 2017 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 <atomic>
+#include <limits>
+#include <memory>
+
+#include "MockData/I2CData.h"
+#include "MockData/NotifyListenerVector.h"
+
+namespace hal {
+class I2CData {
+ public:
+  I2CData();
+  ~I2CData();
+
+  int32_t RegisterInitializedCallback(HAL_NotifyCallback callback, void* param,
+                                      HAL_Bool initialNotify);
+  void CancelInitializedCallback(int32_t uid);
+  void InvokeInitializedCallback(HAL_Value value);
+  HAL_Bool GetInitialized();
+  void SetInitialized(HAL_Bool initialized);
+
+  int32_t RegisterReadCallback(HAL_BufferCallback callback, void* param);
+  void CancelReadCallback(int32_t uid);
+
+  int32_t RegisterWriteCallback(HAL_BufferCallback callback, void* param);
+  void CancelWriteCallback(int32_t uid);
+
+  void Write(int32_t deviceAddress, uint8_t* dataToSend, int32_t sendSize);
+  void Read(int32_t deviceAddress, uint8_t* buffer, int32_t count);
+
+  void ResetData();
+
+ private:
+  std::mutex m_registerMutex;
+  std::mutex m_dataMutex;
+  std::atomic<HAL_Bool> m_initialized{false};
+  std::shared_ptr<NotifyListenerVector> m_initializedCallbacks = nullptr;
+  std::shared_ptr<BufferListenerVector> m_readCallbacks = nullptr;
+  std::shared_ptr<BufferListenerVector> m_writeCallbacks = nullptr;
+};
+extern I2CData SimI2CData[];
+}  // namespace hal