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/ADXRS450_Gyro.h

@@ -0,0 +1,97 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) 2015-2018 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 <stdint.h>
+
+#include "frc/GyroBase.h"
+#include "frc/SPI.h"
+
+namespace frc {
+
+/**
+ * Use a rate gyro to return the robots heading relative to a starting position.
+ *
+ * The Gyro class tracks the robots heading based on the starting position. As
+ * the robot rotates the new heading is computed by integrating the rate of
+ * rotation returned by the sensor. When the class is instantiated, it does a
+ * short calibration routine where it samples the gyro while at rest to
+ * determine the default offset. This is subtracted from each sample to
+ * determine the heading.
+ *
+ * This class is for the digital ADXRS450 gyro sensor that connects via SPI.
+ */
+class ADXRS450_Gyro : public GyroBase {
+ public:
+  /**
+   * Gyro constructor on onboard CS0.
+   */
+  ADXRS450_Gyro();
+
+  /**
+   * Gyro constructor on the specified SPI port.
+   *
+   * @param port The SPI port the gyro is attached to.
+   */
+  explicit ADXRS450_Gyro(SPI::Port port);
+
+  virtual ~ADXRS450_Gyro() = default;
+
+  /**
+   * 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 it will continue from 360->361 degrees.
+   * This allows algorithms that wouldn't want to see a discontinuity in the
+   * gyro output as it sweeps from 360 to 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.
+   */
+  double GetAngle() const override;
+
+  /**
+   * 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 GetRate() const override;
+
+  /**
+   * 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 Reset() override;
+
+  /**
+   * Initialize the gyro.
+   *
+   * Calibrate the gyro by running for a number of samples and computing the
+   * center value. 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 Calibrate() override;
+
+ private:
+  SPI m_spi;
+
+  uint16_t ReadRegister(int reg);
+};
+
+}  // namespace frc