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/src/PWMSpeedController.cpp

@@ -0,0 +1,70 @@
+/*----------------------------------------------------------------------------*/
+/* 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 "PWMSpeedController.h"
+
+/**
+ * Constructor for a PWM Speed Controller connected via PWM.
+ *
+ * @param channel The PWM channel that the controller is attached to. 0-9 are
+ *                on-board, 10-19 are on the MXP port
+ */
+PWMSpeedController::PWMSpeedController(uint32_t channel) : SafePWM(channel) {}
+
+/**
+ * Set the PWM value.
+ *
+ * The PWM value is set using a range of -1.0 to 1.0, appropriately
+ * scaling the value for the FPGA.
+ *
+ * @param speed     The speed value between -1.0 and 1.0 to set.
+ * @param syncGroup Unused interface.
+ */
+void PWMSpeedController::Set(float speed, uint8_t syncGroup) {
+  SetSpeed(m_isInverted ? -speed : speed);
+}
+
+/**
+ * Get the recently set value of the PWM.
+ *
+ * @return The most recently set value for the PWM between -1.0 and 1.0.
+ */
+float PWMSpeedController::Get() const { return GetSpeed(); }
+
+/**
+ * Common interface for disabling a motor.
+ */
+void PWMSpeedController::Disable() { SetRaw(kPwmDisabled); }
+
+/**
+ * Common interface for inverting direction of a speed controller.
+ *
+ * @param isInverted The state of inversion, true is inverted.
+ */
+void PWMSpeedController::SetInverted(bool isInverted) {
+  m_isInverted = isInverted;
+}
+
+/**
+ * Common interface for the inverting direction of a speed controller.
+ *
+ * @return isInverted The state of inversion, true is inverted.
+ *
+ */
+bool PWMSpeedController::GetInverted() const { return m_isInverted; }
+
+/**
+ * Write out the PID value as seen in the PIDOutput base object.
+ *
+ * @param output Write out the PWM value as was found in the PIDController
+ */
+void PWMSpeedController::PIDWrite(float output) { Set(output); }
+
+/**
+ * Common interface to stop the motor until Set is called again.
+ */
+void PWMSpeedController::StopMotor() { this->SafePWM::StopMotor(); }