Port FluidSim core and scenarios to C++20

include/FluidSim/PulseTestScenario.hpp

@@ -0,0 +1,24 @@
+#pragma once
+
+#include "FluidSim/AudioProcessing.hpp"
+#include "FluidSim/Fluid.hpp"
+#include "FluidSim/Solver.hpp"
+#include <vector>
+
+namespace fluidsim::port {
+
+class PulseTestScenario {
+public:
+    explicit PulseTestScenario(int sample_rate = 44100);
+    float process();
+    const Pipe1D& pipe() const { return pipes_.front(); }
+
+private:
+    std::vector<Pipe1D> pipes_;
+    float dt_{}, pipe_area_{};
+    BoundarySystem boundaries_;
+    Solver solver_;
+    SoundProcessor sound_;
+};
+
+} // namespace fluidsim::port