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

wpilibc/src/main/native/include/BuiltInAccelerometer.h

@@ -0,0 +1,48 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) FIRST 2014-2017. 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 <memory>
+#include <string>
+
+#include "LiveWindow/LiveWindowSendable.h"
+#include "SensorBase.h"
+#include "interfaces/Accelerometer.h"
+
+namespace frc {
+
+/**
+ * Built-in accelerometer.
+ *
+ * This class allows access to the roboRIO's internal accelerometer.
+ */
+class BuiltInAccelerometer : public Accelerometer,
+                             public SensorBase,
+                             public LiveWindowSendable {
+ public:
+  explicit BuiltInAccelerometer(Range range = kRange_8G);
+  virtual ~BuiltInAccelerometer() = default;
+
+  // Accelerometer interface
+  void SetRange(Range range) override;
+  double GetX() override;
+  double GetY() override;
+  double GetZ() override;
+
+  std::string GetSmartDashboardType() const override;
+  void InitTable(std::shared_ptr<ITable> subtable) override;
+  void UpdateTable() override;
+  std::shared_ptr<ITable> GetTable() const override;
+  void StartLiveWindowMode() override {}
+  void StopLiveWindowMode() override {}
+
+ private:
+  std::shared_ptr<ITable> m_table;
+};
+
+}  // namespace frc