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/GyroBase.h

@@ -0,0 +1,38 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) 2008-2018 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/ErrorBase.h"
+#include "frc/PIDSource.h"
+#include "frc/interfaces/Gyro.h"
+#include "frc/smartdashboard/SendableBase.h"
+
+namespace frc {
+
+/**
+ * GyroBase is the common base class for Gyro implementations such as
+ * AnalogGyro.
+ */
+class GyroBase : public Gyro,
+                 public ErrorBase,
+                 public SendableBase,
+                 public PIDSource {
+ public:
+  // PIDSource interface
+  /**
+   * Get the PIDOutput for the PIDSource base object. Can be set to return
+   * angle or rate using SetPIDSourceType(). Defaults to angle.
+   *
+   * @return The PIDOutput (angle or rate, defaults to angle)
+   */
+  double PIDGet() override;
+
+  void InitSendable(SendableBuilder& builder) override;
+};
+
+}  // namespace frc