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/sim/src/AnalogGyro.cpp

@@ -0,0 +1,78 @@
+/*----------------------------------------------------------------------------*/
+/* 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.                                                               */
+/*----------------------------------------------------------------------------*/
+
+#include "AnalogGyro.h"
+#include "LiveWindow/LiveWindow.h"
+#include "Timer.h"
+#include "WPIErrors.h"
+
+const uint32_t AnalogGyro::kOversampleBits = 10;
+const uint32_t AnalogGyro::kAverageBits = 0;
+const float AnalogGyro::kSamplesPerSecond = 50.0;
+const float AnalogGyro::kCalibrationSampleTime = 5.0;
+const float AnalogGyro::kDefaultVoltsPerDegreePerSecond = 0.007;
+
+/**
+ * Initialize the gyro.
+ *
+ * Calibrate the gyro by running for a number of samples and computing the
+ * center value for this part. Then use the center value as the Accumulator
+ * center value for subsequent measurements. It's important to make sure that
+ * the robot is not moving while the centering calculations are in progress,
+ * this is typically done when the robot is first turned on while it's sitting
+ * at rest before the competition starts.
+ */
+void AnalogGyro::InitAnalogGyro(int channel) {
+  SetPIDSourceType(PIDSourceType::kDisplacement);
+
+  char buffer[50];
+  int n = sprintf(buffer, "analog/%d", channel);
+  impl = new SimGyro(buffer);
+
+  LiveWindow::GetInstance()->AddSensor("AnalogGyro", channel, this);
+}
+
+/**
+ * AnalogGyro constructor with only a channel.
+ *
+ * @param channel The analog channel the gyro is connected to.
+ */
+AnalogGyro::AnalogGyro(uint32_t channel) { InitAnalogGyro(channel); }
+
+/**
+ * Reset the gyro.
+ *
+ * Resets the gyro to a heading of zero. This can be used if there is
+ * significant drift in the gyro and it needs to be recalibrated after it has
+ * been running.
+ */
+void AnalogGyro::Reset() { impl->Reset(); }
+
+void AnalogGyro::Calibrate() { Reset(); }
+
+/**
+ * Return the actual angle in degrees that the robot is currently facing.
+ *
+ * The angle is based on the current accumulator value corrected by the
+ * oversampling rate, the gyro type and the A/D calibration values. The angle
+ * is continuous, that is can go beyond 360 degrees. This make algorithms that
+ * wouldn't want to see a discontinuity in the gyro output as it sweeps past 0
+ * on the second time around.
+ *
+ * @return the current heading of the robot in degrees. This heading is based on
+ *         integration of the returned rate from the gyro.
+ */
+float AnalogGyro::GetAngle() const { return impl->GetAngle(); }
+
+/**
+ * Return the rate of rotation of the gyro
+ *
+ * The rate is based on the most recent reading of the gyro analog value
+ *
+ * @return the current rate in degrees per second
+ */
+double AnalogGyro::GetRate() const { return impl->GetVelocity(); }