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/DigitalOutput.h

@@ -0,0 +1,64 @@
+/*----------------------------------------------------------------------------*/
+/* 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 <string>
+
+#include "DigitalSource.h"
+#include "HAL/Types.h"
+#include "LiveWindow/LiveWindowSendable.h"
+#include "tables/ITableListener.h"
+
+namespace frc {
+
+/**
+ * Class to write to digital outputs.
+ * Write values to the digital output channels. Other devices implemented
+ * elsewhere will allocate channels automatically so for those devices it
+ * shouldn't be done here.
+ */
+class DigitalOutput : public DigitalSource,
+                      public ITableListener,
+                      public LiveWindowSendable {
+ public:
+  explicit DigitalOutput(int channel);
+  virtual ~DigitalOutput();
+  void Set(bool value);
+  bool Get() const;
+  int GetChannel() const override;
+  void Pulse(double length);
+  bool IsPulsing() const;
+  void SetPWMRate(double rate);
+  void EnablePWM(double initialDutyCycle);
+  void DisablePWM();
+  void UpdateDutyCycle(double dutyCycle);
+
+  // Digital Source Interface
+  HAL_Handle GetPortHandleForRouting() const override;
+  AnalogTriggerType GetAnalogTriggerTypeForRouting() const override;
+  bool IsAnalogTrigger() const override;
+
+  void ValueChanged(ITable* source, llvm::StringRef key,
+                    std::shared_ptr<nt::Value> value, bool isNew) override;
+  void UpdateTable();
+  void StartLiveWindowMode();
+  void StopLiveWindowMode();
+  std::string GetSmartDashboardType() const;
+  void InitTable(std::shared_ptr<ITable> subTable);
+  std::shared_ptr<ITable> GetTable() const;
+
+ private:
+  int m_channel;
+  HAL_DigitalHandle m_handle;
+  HAL_DigitalPWMHandle m_pwmGenerator;
+
+  std::shared_ptr<ITable> m_table;
+};
+
+}  // namespace frc