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/DigitalOutput.h

@@ -0,0 +1,56 @@
+/*----------------------------------------------------------------------------*/
+/* 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 "DigitalSource.h"
+#include "LiveWindow/LiveWindowSendable.h"
+#include "tables/ITableListener.h"
+
+#include <memory>
+
+/**
+ * Class to write to digital outputs.
+ * Write values to the digital output channels. Other devices implemented
+ * elsewhere will allocate channels automatically so for those devices it
+ * shouldn't be done here.
+ */
+class DigitalOutput : public DigitalSource,
+                      public ITableListener,
+                      public LiveWindowSendable {
+ public:
+  explicit DigitalOutput(uint32_t channel);
+  virtual ~DigitalOutput();
+  void Set(uint32_t value);
+  uint32_t GetChannel() const;
+  void Pulse(float length);
+  bool IsPulsing() const;
+  void SetPWMRate(float rate);
+  void EnablePWM(float initialDutyCycle);
+  void DisablePWM();
+  void UpdateDutyCycle(float dutyCycle);
+
+  // Digital Source Interface
+  virtual uint32_t GetChannelForRouting() const;
+  virtual uint32_t GetModuleForRouting() const;
+  virtual bool GetAnalogTriggerForRouting() const;
+
+  virtual void ValueChanged(ITable* source, llvm::StringRef key,
+                            std::shared_ptr<nt::Value> value, bool isNew);
+  void UpdateTable();
+  void StartLiveWindowMode();
+  void StopLiveWindowMode();
+  std::string GetSmartDashboardType() const;
+  void InitTable(std::shared_ptr<ITable> subTable);
+  std::shared_ptr<ITable> GetTable() const;
+
+ private:
+  uint32_t m_channel;
+  void* m_pwmGenerator;
+
+  std::shared_ptr<ITable> m_table;
+};