Spawner

I've started to implement the spawner for items in Teemu. First the spawner collects data from items and determines where items can be created. When the level is created the spawner is scanning the level terrain and creating random items selected from the filtered lists. There can be factors like where the item can be placed and how rarely the item is made and other stuff like that. With the spawner the creation process of items becomes automatic and I can start to add more item variety which is one of the main features of the next version.