Update to 2018_v4 image and new build system. (#598)

* Revert "Force OpenCV to 3.1.0 (#602)"

This reverts commit 50ed55e8e2.

* Removes Simulation

* Removes old build system

* Removes old gtest

* Adds new gmock and gtest

* Updates to new ni-libraries

* removes MyRobot (to be replaced)

* moves files to new location

* Adds new sim backend and new test executables

* updates .styleguide and .gitignore

* Changes cpp WPILibVersion to a function

MSVC throws an AV with the old version.

* Disables USBCamera on all systems except for linux

* 2018 NI Libraries

* New build system

hal/src/main/native/include/HAL/Accelerometer.h

@@ -0,0 +1,28 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) FIRST 2016-2017. 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 "HAL/Types.h"
+
+enum HAL_AccelerometerRange : int32_t {
+  HAL_AccelerometerRange_k2G = 0,
+  HAL_AccelerometerRange_k4G = 1,
+  HAL_AccelerometerRange_k8G = 2,
+};
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+void HAL_SetAccelerometerActive(HAL_Bool active);
+void HAL_SetAccelerometerRange(HAL_AccelerometerRange range);
+double HAL_GetAccelerometerX(void);
+double HAL_GetAccelerometerY(void);
+double HAL_GetAccelerometerZ(void);
+#ifdef __cplusplus
+}
+#endif