Roll of rope

A rope is always useful in all sorts of situations. Two rolls of it can be bought from Tornoth in his smithy.

Current use cases:
 * Required to go with Shyni to the Sejan cave on an adventure with her. It's not removed from the player's inventory.
 * Rappeling down alone in the Sejan cave. One is needed and is removed from the player, they can return to the cave at any time.
 * Lassoing Caenemung. This is only successful with Agility 6 and Strength 10, otherwise the rope is lost in the sea.
 * Rappeling down the abandoned well. Two ropes are needed for this, player loses none.
 * Quickly getting away from the crumbling sinkhole. Requires Agility 8. Rope is not taken away.