feat: post-effects array parameters & add gfx.posteffects.set_array & make shadows opacity depending on clouds opacity

src/world/Weather.hpp

@@ -1,5 +1,6 @@
 #pragma once
 
+#include <glm/glm.hpp>
 #include <string>
 
 #include "presets/WeatherPreset.hpp"
@@ -45,6 +46,11 @@ struct Weather : Serializable {
         return b.thunderRate * t + a.thunderRate * (1.0f - t);
     }
 
+    float clouds() const {
+        float sqrtT = glm::sqrt(t);
+        return b.clouds * sqrtT + a.clouds * (1.0f - sqrtT);
+    }
+
     dv::value serialize() const override;
     void deserialize(const dv::value& src) override;
 };