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.

hal/lib/athena/PDP.cpp

@@ -0,0 +1,80 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) FIRST 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 "HAL/PDP.hpp"
+#include "ctre/PDP.h"
+// static PDP pdp;
+
+static const int NUM_MODULE_NUMBERS = 63;
+
+static PDP* pdp[NUM_MODULE_NUMBERS] = {NULL};
+
+extern "C" {
+
+void initializePDP(uint8_t module) {
+  if (!pdp[module]) {
+    pdp[module] = new PDP(module);
+  }
+}
+
+double getPDPTemperature(uint8_t module, int32_t* status) {
+  double temperature;
+
+  *status = pdp[module]->GetTemperature(temperature);
+
+  return temperature;
+}
+
+double getPDPVoltage(uint8_t module, int32_t* status) {
+  double voltage;
+
+  *status = pdp[module]->GetVoltage(voltage);
+
+  return voltage;
+}
+
+double getPDPChannelCurrent(uint8_t module, uint8_t channel, int32_t* status) {
+  double current;
+
+  *status = pdp[module]->GetChannelCurrent(channel, current);
+
+  return current;
+}
+
+double getPDPTotalCurrent(uint8_t module, int32_t* status) {
+  double current;
+
+  *status = pdp[module]->GetTotalCurrent(current);
+
+  return current;
+}
+
+double getPDPTotalPower(uint8_t module, int32_t* status) {
+  double power;
+
+  *status = pdp[module]->GetTotalPower(power);
+
+  return power;
+}
+
+double getPDPTotalEnergy(uint8_t module, int32_t* status) {
+  double energy;
+
+  *status = pdp[module]->GetTotalEnergy(energy);
+
+  return energy;
+}
+
+void resetPDPTotalEnergy(uint8_t module, int32_t* status) {
+  *status = pdp[module]->ResetEnergy();
+}
+
+void clearPDPStickyFaults(uint8_t module, int32_t* status) {
+  *status = pdp[module]->ClearStickyFaults();
+}
+
+}  // extern "C"