build 210324. event queue text filter enhancement, contextual uncoupling sounds, parameter support for python screens, radio and odometer state exposed to python scripts, configurable audio volume when paused, skydome color calculation tweak, fog color calculation tweak, doorstep cab control enhancement, tempomat cab control enhancement, pantograph selector preset list support, minor bug fixes

simulationenvironment.cpp

@@ -112,7 +112,7 @@ world_environment::update() {
     // twilight factor can be reset later down, so we do it here while it's still reflecting state of the sun
     // turbidity varies from 2-3 during the day based on overcast, 3-4 after sunset to deal with sunlight bleeding too much into the sky from below horizon
     m_skydome.SetTurbidity(
-        2.f
+        2.25f
         + clamp( Global.Overcast, 0.f, 1.f )
         + interpolate( 0.f, 1.f, clamp( twilightfactor * 1.5f, 0.f, 1.f ) ) );
     m_skydome.SetOvercastFactor( Global.Overcast );
@@ -173,8 +173,9 @@ world_environment::update() {
 
     // update the fog. setting it to match the average colour of the sky dome is cheap
     // but quite effective way to make the distant items blend with background better
-    // NOTE: base brightness calculation provides scaled up value, so we bring it back to 'real' one here
-    Global.FogColor = m_skydome.GetAverageHorizonColor();
+    Global.FogColor =
+        interpolate( m_skydome.GetAverageColor(), m_skydome.GetAverageHorizonColor(), 0.33f )
+        * clamp<float>( Global.fLuminance, 0.25f, 1.f );
 
     // weather-related simulation factors
     Global.FrictionWeatherFactor = (