Custom linter: Enforce calls to direct superclass instead of nested superclass

Good:
```cpp
void PlayerStateDamageLife::appear() {
    al::ActorStateBase::appear();
    [...]
}
```

Bad:
```cpp
void PlayerStateDamageLife::appear() {
    al::NerveStateBase::appear();
    [...]
}
```

(Result of discussion in https://discord.com/channels/774687602996936747/1377058054490820668)