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/AnalogTrigger.h

@@ -0,0 +1,37 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) FIRST 2008-2016. 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 "AnalogTriggerOutput.h"
+#include "HAL/HAL.hpp"
+#include "SensorBase.h"
+
+class AnalogInput;
+
+class AnalogTrigger : public SensorBase {
+  friend class AnalogTriggerOutput;
+
+ public:
+  explicit AnalogTrigger(int32_t channel);
+  explicit AnalogTrigger(AnalogInput* channel);
+  virtual ~AnalogTrigger();
+
+  void SetLimitsVoltage(float lower, float upper);
+  void SetLimitsRaw(int32_t lower, int32_t upper);
+  void SetAveraged(bool useAveragedValue);
+  void SetFiltered(bool useFilteredValue);
+  uint32_t GetIndex() const;
+  bool GetInWindow();
+  bool GetTriggerState();
+  std::shared_ptr<AnalogTriggerOutput> CreateOutput(
+      AnalogTriggerType type) const;
+
+ private:
+  uint8_t m_index;
+  void* m_trigger;
+};