Happy monk, Quartet, Seals

Added a new class - Happy Monk.

The Happy Monk gets a significant bonus to strength if the monk has a large amount of health.

Other changes:

• Sealed books have been added. You can unseal them with unburnable manuscripts (zone 75 or higher).

• Added new quest: Quartet!

• Added achievement that opens the new quest.

• Added filters for achievements.

• Changed the name of the auto-turn button, in order to avoid confusion.