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.

wpilibcExamples/src/main/cpp/examples/GearsBot/include/subsystems/DriveTrain.h

@@ -0,0 +1,84 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) 2017-2018 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 <frc/AnalogGyro.h>
+#include <frc/AnalogInput.h>
+#include <frc/Encoder.h>
+#include <frc/Spark.h>
+#include <frc/SpeedControllerGroup.h>
+#include <frc/commands/Subsystem.h>
+#include <frc/drive/DifferentialDrive.h>
+
+namespace frc {
+class Joystick;
+}  // namespace frc
+
+/**
+ * The DriveTrain subsystem incorporates the sensors and actuators attached to
+ * the robots chassis. These include four drive motors, a left and right encoder
+ * and a gyro.
+ */
+class DriveTrain : public frc::Subsystem {
+ public:
+  DriveTrain();
+
+  /**
+   * When no other command is running let the operator drive around
+   * using the PS3 joystick.
+   */
+  void InitDefaultCommand() override;
+
+  /**
+   * The log method puts interesting information to the SmartDashboard.
+   */
+  void Log();
+
+  /**
+   * Tank style driving for the DriveTrain.
+   * @param left Speed in range [-1,1]
+   * @param right Speed in range [-1,1]
+   */
+  void Drive(double left, double right);
+
+  /**
+   * @return The robots heading in degrees.
+   */
+  double GetHeading();
+
+  /**
+   * Reset the robots sensors to the zero states.
+   */
+  void Reset();
+
+  /**
+   * @return The distance driven (average of left and right encoders).
+   */
+  double GetDistance();
+
+  /**
+   * @return The distance to the obstacle detected by the rangefinder.
+   */
+  double GetDistanceToObstacle();
+
+ private:
+  frc::Spark m_frontLeft{1};
+  frc::Spark m_rearLeft{2};
+  frc::SpeedControllerGroup m_left{m_frontLeft, m_rearLeft};
+
+  frc::Spark m_frontRight{3};
+  frc::Spark m_rearRight{4};
+  frc::SpeedControllerGroup m_right{m_frontRight, m_rearRight};
+
+  frc::DifferentialDrive m_robotDrive{m_left, m_right};
+
+  frc::Encoder m_leftEncoder{1, 2};
+  frc::Encoder m_rightEncoder{3, 4};
+  frc::AnalogInput m_rangefinder{6};
+  frc::AnalogGyro m_gyro{1};
+};