Introduction quest from Godwin to help the farmers

The quest takes place before the decision whether to join the rebels,
to introduce some background information. The quest also contains a hint
to the beetle stew quest from Chef Odo.

Quest steps:
- Get quest from Godwin
- meet Arbert in the pub
- hunt beetles and show a certain amount of beetle corpses to Arbert
- report back to Godwin

Related changes: increase beetle spawn amount on the fields
The function is already getting pretty long. Maybe we should think of ways to allow shorter function in the future... Maybe nested functions would be fine too...

But thats for the future too...