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/SendableChooser.h

@@ -0,0 +1,60 @@
+/*----------------------------------------------------------------------------*/
+/* 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 "SmartDashboard/SendableChooserBase.h"
+#include "llvm/StringMap.h"
+#include "llvm/StringRef.h"
+#include "tables/ITable.h"
+
+namespace frc {
+
+/**
+ * The {@link SendableChooser} class is a useful tool for presenting a selection
+ * of options to the {@link SmartDashboard}.
+ *
+ * <p>For instance, you may wish to be able to select between multiple
+ * autonomous modes. You can do this by putting every possible {@link Command}
+ * you want to run as an autonomous into a {@link SendableChooser} and then put
+ * it into the {@link SmartDashboard} to have a list of options appear on the
+ * laptop.  Once autonomous starts, simply ask the {@link SendableChooser} what
+ * the selected value is.</p>
+ *
+ * @tparam T The type of values to be stored
+ * @see SmartDashboard
+ */
+template <class T>
+class SendableChooser : public SendableChooserBase {
+  llvm::StringMap<T> m_choices;
+
+  template <class U>
+  static U _unwrap_smart_ptr(const U& value);
+
+  template <class U>
+  static U* _unwrap_smart_ptr(const std::unique_ptr<U>& value);
+
+  template <class U>
+  static std::weak_ptr<U> _unwrap_smart_ptr(const std::shared_ptr<U>& value);
+
+ public:
+  virtual ~SendableChooser() = default;
+
+  void AddObject(llvm::StringRef name, T object);
+  void AddDefault(llvm::StringRef name, T object);
+
+  auto GetSelected() -> decltype(_unwrap_smart_ptr(m_choices[""]));
+
+  void InitTable(std::shared_ptr<ITable> subtable) override;
+};
+
+}  // namespace frc
+
+#include "SendableChooser.inc"