refactor basic API to favor a declarative/data-oriented style

[facundoolano]

This:

(def living (-> (room/make "Living Room"
                           "A living room with a nailed shut window"
                           :initial-description "The living room was as smelly as the bedroom..."
                           :synonyms ["living" "livingroom"])
                (room/add-item drawer "There was a chest drawer by the door.")
                (room/add-item door "")
                (room/add-item glass-door "")
                (room/add-item portrait "A portrait ocuppied a very prominent place on one of the walls.")
                (room/add-item (item/make ["window"] "It was nailed shut." :closed true :open "It was nailed shut.") "")))

Should turn into this

(def living (room/make {:name                "Living Room"
                        :description         "A living room with a nailed shut window"
                        :initial-description "The living room was as smelly as the bedroom..."
                        :synonyms            ["living" "livingroom"]
                        :items               [drawer door glass-door portrait
                                              (item/make {:names       ["window"]
                                                          :description "It was nailed shut."
                                                          :closed      true
                                                          :open        "It was nailed shut."})]}
                       :item-descriptions {"drawer"   "There was a chest drawer by the door."
                                           "portrait" "A portrait ocuppied a very prominent place on one of the walls."}))