Day 7
Made simple system for items (the only item for now is gold). Also added chest as basic source of gold (another one being monsters). By the way, since monsters can interact with objects, they are able to open chests, and if they do, hero has to defeat them in order to get loot. There will be several other systems related to this in future.
Tomorrow most likely I will implement system for usable items (e.g. potion that hero can use to heal up).