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.

wpilibNewCommands/src/main/native/cpp/frc2/command/ProfiledPIDCommand.cpp

@@ -0,0 +1,67 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) 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.                                                               */
+/*----------------------------------------------------------------------------*/
+
+#include "frc2/command/ProfiledPIDCommand.h"
+
+using namespace frc2;
+using State = frc::TrapezoidProfile::State;
+
+ProfiledPIDCommand::ProfiledPIDCommand(
+    frc::ProfiledPIDController controller,
+    std::function<units::meter_t()> measurementSource,
+    std::function<State()> goalSource,
+    std::function<void(double, State)> useOutput,
+    std::initializer_list<Subsystem*> requirements)
+    : m_controller{controller},
+      m_measurement{std::move(measurementSource)},
+      m_goal{std::move(goalSource)},
+      m_useOutput{std::move(useOutput)} {
+  AddRequirements(requirements);
+}
+
+ProfiledPIDCommand::ProfiledPIDCommand(
+    frc::ProfiledPIDController controller,
+    std::function<units::meter_t()> measurementSource,
+    std::function<units::meter_t()> goalSource,
+    std::function<void(double, State)> useOutput,
+    std::initializer_list<Subsystem*> requirements)
+    : ProfiledPIDCommand(controller, measurementSource,
+                         [&goalSource]() {
+                           return State{goalSource(), 0_mps};
+                         },
+                         useOutput, requirements) {}
+
+ProfiledPIDCommand::ProfiledPIDCommand(
+    frc::ProfiledPIDController controller,
+    std::function<units::meter_t()> measurementSource, State goal,
+    std::function<void(double, State)> useOutput,
+    std::initializer_list<Subsystem*> requirements)
+    : ProfiledPIDCommand(controller, measurementSource, [goal] { return goal; },
+                         useOutput, requirements) {}
+
+ProfiledPIDCommand::ProfiledPIDCommand(
+    frc::ProfiledPIDController controller,
+    std::function<units::meter_t()> measurementSource, units::meter_t goal,
+    std::function<void(double, State)> useOutput,
+    std::initializer_list<Subsystem*> requirements)
+    : ProfiledPIDCommand(controller, measurementSource, [goal] { return goal; },
+                         useOutput, requirements) {}
+
+void ProfiledPIDCommand::Initialize() { m_controller.Reset(); }
+
+void ProfiledPIDCommand::Execute() {
+  m_useOutput(m_controller.Calculate(m_measurement(), m_goal()),
+              m_controller.GetSetpoint());
+}
+
+void ProfiledPIDCommand::End(bool interrupted) {
+  m_useOutput(0, State{0_m, 0_mps});
+}
+
+frc::ProfiledPIDController& ProfiledPIDCommand::GetController() {
+  return m_controller;
+}