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/MonoImage.h

@@ -0,0 +1,24 @@
+/*----------------------------------------------------------------------------*/
+/* 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 "ImageBase.h"
+
+#include <vector>
+
+class MonoImage : public ImageBase {
+ public:
+  MonoImage();
+  virtual ~MonoImage() = default;
+
+  std::vector<EllipseMatch>* DetectEllipses(
+      EllipseDescriptor* ellipseDescriptor, CurveOptions* curveOptions,
+      ShapeDetectionOptions* shapeDetectionOptions, ROI* roi);
+  std::vector<EllipseMatch>* DetectEllipses(
+      EllipseDescriptor* ellipseDescriptor);
+};