[sim] Add GUI support for the REV PH (#6704)

simulation/halsim_gui/src/main/native/cpp/PHSimGui.h

@@ -0,0 +1,20 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#pragma once
+#include <glass/hardware/Pneumatic.h>
+
+#include <memory>
+
+namespace halsimgui {
+
+class PHSimGui {
+ public:
+  static void Initialize();
+  static bool PHsAnyInitialized();
+  static bool PHsAnySolenoids(glass::PneumaticControlsModel* model);
+  static std::unique_ptr<glass::PneumaticControlsModel> GetPHsModel();
+};
+
+}  // namespace halsimgui