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/DigitalInput.h

@@ -0,0 +1,55 @@
+/*----------------------------------------------------------------------------*/
+/* 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 "LiveWindow/LiveWindowSendable.h"
+
+namespace frc {
+
+class DigitalGlitchFilter;
+
+/**
+ * Class to read a digital input.
+ * This class will read digital inputs and return the current value on the
+ * channel. Other devices such as encoders, gear tooth sensors, etc. that are
+ * implemented elsewhere will automatically allocate digital inputs and outputs
+ * as required. This class is only for devices like switches etc. that aren't
+ * implemented anywhere else.
+ */
+class DigitalInput : public DigitalSource, public LiveWindowSendable {
+ public:
+  explicit DigitalInput(int channel);
+  virtual ~DigitalInput();
+  bool Get() const;
+  int GetChannel() const override;
+
+  // Digital Source Interface
+  HAL_Handle GetPortHandleForRouting() const override;
+  AnalogTriggerType GetAnalogTriggerTypeForRouting() const override;
+  bool IsAnalogTrigger() const 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;
+
+  std::shared_ptr<ITable> m_table;
+  friend class DigitalGlitchFilter;
+};
+
+}  // namespace frc