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