[hal] Add a unified PCM object (#3331)

wpilibcExamples/src/main/cpp/examples/HatchbotTraditional/include/subsystems/HatchSubsystem.h

@@ -5,6 +5,7 @@
 #pragma once
 
 #include <frc/DoubleSolenoid.h>
+#include <frc/PneumaticsControlModule.h>
 #include <frc2/command/SubsystemBase.h>
 
 #include "Constants.h"
@@ -28,5 +29,6 @@ class HatchSubsystem : public frc2::SubsystemBase {
  private:
   // Components (e.g. motor controllers and sensors) should generally be
   // declared private and exposed only through public methods.
+  frc::PneumaticsControlModule m_pneumaticsModule;
   frc::DoubleSolenoid m_hatchSolenoid;
 };