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
Hm... right now changing the ids is still possible since they do not seem to be persisted anywhere... But for the future we probably need to find a better way of handling this... (Maybe strings would be more useful in this context...)

But nothing to worry about now.