move weather from WorldRenderer to LevelFrontend

src/logic/scripting/lua/libs/libweather.cpp

@@ -2,6 +2,7 @@
 
 #include "world/Level.hpp"
 #include "world/World.hpp"
+#include "world/Weather.hpp"
 
 using namespace scripting;
 
@@ -9,6 +10,11 @@ static Weather& require_weather() {
     if (level == nullptr) {
         throw std::runtime_error("world is not open");
     }
+    if (renderer == nullptr) {
+        throw std::runtime_error(
+            "world frontend is not initialized yet (wait for on_hud_open event)"
+        );
+    }
     return renderer->getWeather();
 }