Add difficulty and length to quest overview

[mattthw]

When choosing a quest to start I always take these into account. I am sure many other people do too. Addings two new fields to each quest would allow users to view this information before deciding to start a quest.

Scenario: User is drinking and wants to avoid difficult quest.

Scenario: User only has an hour to play and wants to start a quest they can finish in one session.

Adding these can also allow the future improvement of sorting by difficulty or length. That would be considered a separate task. Taking this into consideration would be best when implementing this.