Add American V8 preset, carb fuel transport, and adaptive desktop audio

include/FluidSim/TwoStrokeScenario.hpp

@@ -2,6 +2,7 @@
 
 #include "FluidSim/AudioProcessing.hpp"
 #include "FluidSim/Crankcase.hpp"
+#include "FluidSim/Carburetor.hpp"
 #include "FluidSim/Fluid.hpp"
 #include "FluidSim/OutdoorAudio.hpp"
 #include "FluidSim/Atmosphere.hpp"
@@ -44,6 +45,7 @@ public:
     float throttle{};
     const TwoStrokeConfig configuration;
     Ecu ecu{};
+    Carburetor carburetor;
     ReedValve reed{};
     Atmosphere intake_atmosphere{};
     float intake_flow{}, exhaust_flow{};
@@ -65,6 +67,7 @@ private:
     OutdoorAudio audio_;
 
     static float area_for_diameter(float diameter);
+    static float slide_area(float diameter, float opening);
     static std::vector<Pipe1D> create_pipes(const TwoStrokeConfig& config);
 };