Roll of rope

A rope can be useful to the player in all sorts of situations. Two rolls of it can be bought from Tornoth in his smithy.

Current use cases:
 * It is required to buy one roll to go to the Sejan cave adventure with Shyni. (Don't buy the roll before being asked to by her, she covers half of its cost.) It's not removed from the player's inventory. Note that if the player has already spent a rope when exploring the Sejan caves by themselves, buying a new rope is not necessary.
 * If the player wishes to go spelunking the Sejan cave alone, one roll is spent to get them down deeper into the caves. The roll is spent permanently in this case, but the player can return to the deep caves at any time.
 * One roll of rope can be used to prevent Caenemung from fleeing back into the sea after being defeated in combat. This can only be successful with Agility 6 and Strength 10. If the player's attempt is unsuccessful due to their low agility, the rope is kept. If it is unsuccessful due to the player's low strength, the rope is lost.
 * After clearing the thorny bush from out of the way, the player can rappel down the abandoned well to see if little Timmy fell down it after all. Two ropes are needed to get a combined rope long enough to reach the bottom of the well. The player loses neither of the ropes even after it collapses.
 * When ambushed by the earth itself at the northern part of Sejan, the player can use a rope to quickly get away from the crumbling sinkhole. They will need Agility 8 to properly use the rope in a hurry. It is not lost in this event.