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/Subsystem.h

@@ -0,0 +1,165 @@
+/*----------------------------------------------------------------------------*/
+/* 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/StringRef.h>
+#include <wpi/Twine.h>
+
+#include "frc/ErrorBase.h"
+#include "frc/smartdashboard/Sendable.h"
+#include "frc/smartdashboard/SendableBase.h"
+
+namespace frc {
+
+class Command;
+
+class Subsystem : public ErrorBase, public SendableBase {
+  friend class Scheduler;
+
+ public:
+  /**
+   * Creates a subsystem with the given name.
+   *
+   * @param name the name of the subsystem
+   */
+  explicit Subsystem(const wpi::Twine& name);
+
+  /**
+   * Sets the default command. If this is not called or is called with null,
+   * then there will be no default command for the subsystem.
+   *
+   * <b>WARNING:</b> This should <b>NOT</b> be called in a constructor if the
+   * subsystem is a singleton.
+   *
+   * @param command the default command (or null if there should be none)
+   */
+  void SetDefaultCommand(Command* command);
+
+  /**
+   * Returns the default command (or null if there is none).
+   *
+   * @return the default command
+   */
+  Command* GetDefaultCommand();
+
+  /**
+   * Returns the default command name, or empty string is there is none.
+   *
+   * @return the default command name
+   */
+  wpi::StringRef GetDefaultCommandName();
+
+  /**
+   * Sets the current command.
+   *
+   * @param command the new current command
+   */
+  void SetCurrentCommand(Command* command);
+
+  /**
+   * Returns the command which currently claims this subsystem.
+   *
+   * @return the command which currently claims this subsystem
+   */
+  Command* GetCurrentCommand() const;
+
+  /**
+   * Returns the current command name, or empty string if no current command.
+   *
+   * @return the current command name
+   */
+  wpi::StringRef GetCurrentCommandName() const;
+
+  /**
+   * When the run method of the scheduler is called this method will be called.
+   */
+  virtual void Periodic();
+
+  /**
+   * Initialize the default command for this subsystem.
+   *
+   * This is meant to be the place to call SetDefaultCommand in a subsystem and
+   * will be called on all the subsystems by the CommandBase method before the
+   * program starts running by using the list of all registered Subsystems
+   * inside the Scheduler.
+   *
+   * This should be overridden by a Subsystem that has a default Command
+   */
+  virtual void InitDefaultCommand();
+
+  /**
+   * Associate a Sendable with this Subsystem.
+   * Also update the child's name.
+   *
+   * @param name name to give child
+   * @param child sendable
+   */
+  void AddChild(const wpi::Twine& name, std::shared_ptr<Sendable> child);
+
+  /**
+   * Associate a Sendable with this Subsystem.
+   * Also update the child's name.
+   *
+   * @param name name to give child
+   * @param child sendable
+   */
+  void AddChild(const wpi::Twine& name, Sendable* child);
+
+  /**
+   * Associate a Sendable with this Subsystem.
+   * Also update the child's name.
+   *
+   * @param name name to give child
+   * @param child sendable
+   */
+  void AddChild(const wpi::Twine& name, Sendable& child);
+
+  /**
+   * Associate a {@link Sendable} with this Subsystem.
+   *
+   * @param child sendable
+   */
+  void AddChild(std::shared_ptr<Sendable> child);
+
+  /**
+   * Associate a {@link Sendable} with this Subsystem.
+   *
+   * @param child sendable
+   */
+  void AddChild(Sendable* child);
+
+  /**
+   * Associate a {@link Sendable} with this Subsystem.
+   *
+   * @param child sendable
+   */
+  void AddChild(Sendable& child);
+
+ private:
+  /**
+   * Call this to alert Subsystem that the current command is actually the
+   * command.
+   *
+   * Sometimes, the Subsystem is told that it has no command while the Scheduler
+   * is going through the loop, only to be soon after given a new one. This will
+   * avoid that situation.
+   */
+  void ConfirmCommand();
+
+  Command* m_currentCommand = nullptr;
+  bool m_currentCommandChanged = true;
+  Command* m_defaultCommand = nullptr;
+  bool m_initializedDefaultCommand = false;
+
+ public:
+  void InitSendable(SendableBuilder& builder) override;
+};
+
+}  // namespace frc