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/SmartDashboard/Sendable.h

@@ -0,0 +1,37 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) FIRST 2011-2017. 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 "tables/ITable.h"
+
+namespace frc {
+
+class Sendable {
+ public:
+  /**
+   * Initializes a table for this sendable object.
+   * @param subtable The table to put the values in.
+   */
+  virtual void InitTable(std::shared_ptr<ITable> subtable) = 0;
+
+  /**
+   * @return the table that is currently associated with the sendable
+   */
+  virtual std::shared_ptr<ITable> GetTable() const = 0;
+
+  /**
+   * @return the string representation of the named data type that will be used
+   *         by the smart dashboard for this sendable
+   */
+  virtual std::string GetSmartDashboardType() const = 0;
+};
+
+}  // namespace frc