Split the two command implementations into separate libraries (#2012)

This will allow us at the user code side to determine to include old commands, new commands or both.

wpilibOldCommands/src/main/native/include/frc/commands/TimedCommand.h

@@ -0,0 +1,67 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) 2016-2019 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 <wpi/Twine.h>
+
+#include "frc/commands/Command.h"
+
+namespace frc {
+
+/**
+ * A TimedCommand will wait for a timeout before finishing.
+ *
+ * TimedCommand is used to execute a command for a given amount of time.
+ */
+class TimedCommand : public Command {
+ public:
+  /**
+   * Creates a new TimedCommand with the given name and timeout.
+   *
+   * @param name    the name of the command
+   * @param timeout the time (in seconds) before this command "times out"
+   */
+  TimedCommand(const wpi::Twine& name, double timeout);
+
+  /**
+   * Creates a new WaitCommand with the given timeout.
+   *
+   * @param timeout the time (in seconds) before this command "times out"
+   */
+  explicit TimedCommand(double timeout);
+
+  /**
+   * Creates a new TimedCommand with the given name and timeout.
+   *
+   * @param name      the name of the command
+   * @param timeout   the time (in seconds) before this command "times out"
+   * @param subsystem the subsystem that the command requires
+   */
+  TimedCommand(const wpi::Twine& name, double timeout, Subsystem& subsystem);
+
+  /**
+   * Creates a new WaitCommand with the given timeout.
+   *
+   * @param timeout   the time (in seconds) before this command "times out"
+   * @param subsystem the subsystem that the command requires
+   */
+  TimedCommand(double timeout, Subsystem& subsystem);
+
+  virtual ~TimedCommand() = default;
+
+  TimedCommand(TimedCommand&&) = default;
+  TimedCommand& operator=(TimedCommand&&) = default;
+
+ protected:
+  /**
+   * Ends command when timed out.
+   */
+  bool IsFinished() override;
+};
+
+}  // namespace frc