Move CameraServer and WPILib headers into their own folder

The old headers were moved into folders because doing so avoids polluting
the system include directories.

Folder names were also normalized to lowercase.

wpilibc/src/main/native/include/frc/commands/PIDCommand.h

@@ -0,0 +1,61 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) 2011-2018 FIRST. 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 <memory>
+
+#include <wpi/Twine.h>
+
+#include "frc/PIDController.h"
+#include "frc/PIDOutput.h"
+#include "frc/PIDSource.h"
+#include "frc/commands/Command.h"
+
+namespace frc {
+
+class PIDCommand : public Command, public PIDOutput, public PIDSource {
+ public:
+  PIDCommand(const wpi::Twine& name, double p, double i, double d);
+  PIDCommand(const wpi::Twine& name, double p, double i, double d,
+             double period);
+  PIDCommand(const wpi::Twine& name, double p, double i, double d, double f,
+             double period);
+  PIDCommand(double p, double i, double d);
+  PIDCommand(double p, double i, double d, double period);
+  PIDCommand(double p, double i, double d, double f, double period);
+  virtual ~PIDCommand() = default;
+
+  void SetSetpointRelative(double deltaSetpoint);
+
+  // PIDOutput interface
+  void PIDWrite(double output) override;
+
+  // PIDSource interface
+  double PIDGet() override;
+
+ protected:
+  std::shared_ptr<PIDController> GetPIDController() const;
+  void _Initialize() override;
+  void _Interrupted() override;
+  void _End() override;
+  void SetSetpoint(double setpoint);
+  double GetSetpoint() const;
+  double GetPosition();
+
+  virtual double ReturnPIDInput() = 0;
+  virtual void UsePIDOutput(double output) = 0;
+
+ private:
+  // The internal PIDController
+  std::shared_ptr<PIDController> m_controller;
+
+ public:
+  void InitSendable(SendableBuilder& builder) override;
+};
+
+}  // namespace frc