Update notes for submitted changes

* [Added] possiblity to return a value through the callFunctionIfNotNil function in quest task module. [Added] error when calling a function that is nil through the callFunctionIfNotNil function in the quest task module. [Added] return value in mocks for SpawnMobiles.spawnMobile. [Changed] getSpawnedMobiles to be an interface function of SpawnMobiles module. [Added] Quest encounter module.