std::cout stream is mixed between threads

```
Section [Deers] Thread [Section [Grain] Thread [01] - computing deers] - computing grain

Section [Deers] Thread [0Section [Grain] Thread [1] - updating grain] - updating deers

Section [Watcher] Thread [2] - printing and updating states
```
Related threads:
[Is cout sync?](https://stackoverflow.com/questions/6374264/is-cout-synchronized-thread-safe)