update entity.spawn(...): now returns an Entity instead of id

src/logic/scripting/lua/libentity.cpp

@@ -31,8 +31,8 @@ static int l_spawn(lua::State* L) {
     auto defname = lua::tostring(L, 1);
     auto& def = content->entities.require(defname);
     auto pos = lua::tovec3(L, 2);
-    auto id = level->entities->spawn(def, pos);
-    return lua::pushinteger(L, id);
+    level->entities->spawn(def, pos);
+    return 1;
 }
 
 static int l_despawn(lua::State* L) {