Updates for v1.8.0

Some updates to the OST for v1.8.0:
- updated the violin sample for A Black Mark from Violin 1 to Violin 2 to avoid some shrillness
- new piece for the fae caravan (Caravan of Winds)
- new piece for the Caldera (Tall Pines and Cold Dark Water)
- new piece for the shrines (The Still-Beating Heart of the World)
- tweaked the levels somewhat