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/AnalogTrigger.h

@@ -0,0 +1,45 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) FIRST 2008-2017. 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 "AnalogTriggerOutput.h"
+#include "HAL/Types.h"
+#include "SensorBase.h"
+
+namespace frc {
+
+class AnalogInput;
+
+class AnalogTrigger : public SensorBase {
+  friend class AnalogTriggerOutput;
+
+ public:
+  explicit AnalogTrigger(int channel);
+  explicit AnalogTrigger(AnalogInput* channel);
+  virtual ~AnalogTrigger();
+
+  void SetLimitsVoltage(double lower, double upper);
+  void SetLimitsRaw(int lower, int upper);
+  void SetAveraged(bool useAveragedValue);
+  void SetFiltered(bool useFilteredValue);
+  int GetIndex() const;
+  bool GetInWindow();
+  bool GetTriggerState();
+  std::shared_ptr<AnalogTriggerOutput> CreateOutput(
+      AnalogTriggerType type) const;
+
+ private:
+  int m_index;
+  HAL_AnalogTriggerHandle m_trigger;
+  AnalogInput* m_analogInput = nullptr;
+  bool m_ownsAnalog = false;
+};
+
+}  // namespace frc