add gfx.weather library & add weather.set command

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

@@ -0,0 +1,16 @@
+#include "libhud.hpp"
+
+using namespace scripting;
+
+static int l_change(lua::State* L) {
+    WeatherPreset weather {};
+    weather.deserialize(lua::tovalue(L, 1));
+    float time = lua::tonumber(L, 2);
+    renderer->weather.change(std::move(weather), time);
+    return 0;
+}
+
+const luaL_Reg weatherlib[] = {
+    {"change", wrap_hud<l_change>},
+    {NULL, NULL}
+};