message: disallow to pick items, while mobsi is in use
diff: @@ -2341,6 +2341,9 @@ Item* Npc::addItem(std::unique_ptr<Item>&& i) {
  }
  Item* Npc::takeItem(Item& item) {
  + if(interactive()!=nullptr)
  + return nullptr;
  +
  auto dpos = item.position()-position();
  dpos.y-=translateY();
  