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/sim/Accelerometer.cpp

@@ -0,0 +1,25 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) FIRST 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.                                                               */
+/*----------------------------------------------------------------------------*/
+
+#include "HAL/Accelerometer.h"
+
+#include "MockData/AccelerometerDataInternal.h"
+
+using namespace hal;
+
+extern "C" {
+void HAL_SetAccelerometerActive(HAL_Bool active) {
+  SimAccelerometerData[0].SetActive(active);
+}
+
+void HAL_SetAccelerometerRange(HAL_AccelerometerRange range) {
+  SimAccelerometerData[0].SetRange(range);
+}
+double HAL_GetAccelerometerX(void) { return SimAccelerometerData[0].GetX(); }
+double HAL_GetAccelerometerY(void) { return SimAccelerometerData[0].GetY(); }
+double HAL_GetAccelerometerZ(void) { return SimAccelerometerData[0].GetZ(); }
+}