Renamed folders for consistency, using sim/athena/shared schema (#27)

Rename the following folders:
hal/lib/Athena -> hal/lib/athena
hal/lib/Desktop -> hal/lib/sim
hal/lib/Shared -> hal/lib/shared
wpilibc/Athena -> wpilibc/athena
wpilibc/simulation -> wpilibc/sim

Windows users may need to run gradlew clean after updating.

wpilibc/athena/include/CameraServer.h

@@ -0,0 +1,83 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) FIRST 2014-2016. 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 "ErrorBase.h"
+#include "NIIMAQdx.h"
+#include "USBCamera.h"
+#include "nivision.h"
+
+#include <condition_variable>
+#include <memory>
+#include <thread>
+#include <tuple>
+#include <vector>
+#include "HAL/cpp/priority_mutex.h"
+
+class CameraServer : public ErrorBase {
+ private:
+  static constexpr uint16_t kPort = 1180;
+  static constexpr uint8_t kMagicNumber[] = {0x01, 0x00, 0x00, 0x00};
+  static constexpr uint32_t kSize640x480 = 0;
+  static constexpr uint32_t kSize320x240 = 1;
+  static constexpr uint32_t kSize160x120 = 2;
+  static constexpr int32_t kHardwareCompression = -1;
+  static constexpr uint32_t kMaxImageSize = 200000;
+
+ protected:
+  CameraServer();
+
+  std::shared_ptr<USBCamera> m_camera;
+  std::thread m_serverThread;
+  std::thread m_captureThread;
+  priority_recursive_mutex m_imageMutex;
+  std::condition_variable_any m_newImageVariable;
+  std::vector<uint8_t*> m_dataPool;
+  unsigned int m_quality;
+  bool m_autoCaptureStarted;
+  bool m_hwClient;
+  std::tuple<uint8_t*, unsigned int, unsigned int, bool> m_imageData;
+
+  void Serve();
+  void AutoCapture();
+  void SetImageData(uint8_t* data, unsigned int size, unsigned int start = 0,
+                    bool imaqData = false);
+  void FreeImageData(
+      std::tuple<uint8_t*, unsigned int, unsigned int, bool> imageData);
+
+  struct Request {
+    uint32_t fps;
+    int32_t compression;
+    uint32_t size;
+  };
+
+ public:
+  static CameraServer* GetInstance();
+  void SetImage(Image const* image);
+
+  void StartAutomaticCapture(
+      char const* cameraName = USBCamera::kDefaultCameraName);
+
+  /**
+   * Start automatically capturing images to send to the dashboard.
+   *
+   * You should call this method to just see a camera feed on the
+   * dashboard without doing any vision processing on the roboRIO.
+   * {@link #SetImage} should not be called after this is called.
+   *
+   * @param camera The camera interface (eg. USBCamera)
+   */
+  void StartAutomaticCapture(std::shared_ptr<USBCamera> camera);
+
+  bool IsAutoCaptureStarted();
+
+  void SetQuality(unsigned int quality);
+  unsigned int GetQuality();
+
+  void SetSize(unsigned int size);
+};