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/Error.h

@@ -0,0 +1,65 @@
+/*----------------------------------------------------------------------------*/
+/* 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 <stdint.h>
+
+#include <string>
+
+#include "Base.h"
+#include "llvm/StringRef.h"
+
+#ifdef _WIN32
+#include <Windows.h>
+// Windows.h defines #define GetMessage GetMessageW, which we don't want.
+#undef GetMessage
+#endif
+
+namespace frc {
+
+//  Forward declarations
+class ErrorBase;
+
+/**
+ * Error object represents a library error.
+ */
+class Error {
+ public:
+  typedef int Code;
+
+  Error() = default;
+
+  Error(const Error&) = delete;
+  Error& operator=(const Error&) = delete;
+
+  void Clone(const Error& error);
+  Code GetCode() const;
+  std::string GetMessage() const;
+  std::string GetFilename() const;
+  std::string GetFunction() const;
+  int GetLineNumber() const;
+  const ErrorBase* GetOriginatingObject() const;
+  double GetTimestamp() const;
+  void Clear();
+  void Set(Code code, llvm::StringRef contextMessage, llvm::StringRef filename,
+           llvm::StringRef function, int lineNumber,
+           const ErrorBase* originatingObject);
+
+ private:
+  void Report();
+
+  Code m_code = 0;
+  std::string m_message;
+  std::string m_filename;
+  std::string m_function;
+  int m_lineNumber = 0;
+  const ErrorBase* m_originatingObject = nullptr;
+  double m_timestamp = 0.0;
+};
+
+}  // namespace frc