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/Vision/FrcError.h

@@ -0,0 +1,30 @@
+/*----------------------------------------------------------------------------*/
+/* 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
+
+/* Error Codes */
+#define ERR_VISION_GENERAL_ERROR 166000  //
+#define ERR_COLOR_NOT_FOUND 166100       // TrackAPI.cpp
+#define ERR_PARTICLE_TOO_SMALL 166101    // TrackAPI.cpp
+
+#define ERR_CAMERA_FAILURE 166200                  // AxisCamera.cpp
+#define ERR_CAMERA_SOCKET_CREATE_FAILED 166201     // AxisCamera.cpp
+#define ERR_CAMERA_CONNECT_FAILED 166202           // AxisCamera.cpp
+#define ERR_CAMERA_STALE_IMAGE 166203              // AxisCamera.cpp
+#define ERR_CAMERA_NOT_INITIALIZED 166204          // AxisCamera.cpp
+#define ERR_CAMERA_NO_BUFFER_AVAILABLE 166205      // AxisCamera.cpp
+#define ERR_CAMERA_HEADER_ERROR 166206             // AxisCamera.cpp
+#define ERR_CAMERA_BLOCKING_TIMEOUT 166207         // AxisCamera.cpp
+#define ERR_CAMERA_AUTHORIZATION_FAILED 166208     // AxisCamera.cpp
+#define ERR_CAMERA_TASK_SPAWN_FAILED 166209        // AxisCamera.cpp
+#define ERR_CAMERA_TASK_INPUT_OUT_OF_RANGE 166210  // AxisCamera.cpp
+#define ERR_CAMERA_COMMAND_FAILURE 166211          // AxisCamera.cpp
+
+/* error handling functions */
+int GetLastVisionError();
+const char* GetVisionErrorText(int errorCode);