Adds sugar, chocolate, and baker companion book

Bakeries now have a little more sugar in the counters along with some chocolate bars for baking. In addition there's a chance for a baker's companion book to spawn in the kitchen so you can learn to bake a cake there.

data/json/mapgen/bakery.json

@@ -99,7 +99,7 @@
         "t": [ { "item": "pizza_table", "chance": 20 }, { "item": "coffee_dishes", "chance": 25 } ],
         "@": { "item": "trash", "chance": 75 },
         "a": { "item": "trash", "chance": 75, "repeat": [ 2, 4 ] },
-        "k": { "item": "groce_ingredient", "chance": 50, "repeat": [ 1, 3 ] },
+        "k": [ { "item": "groce_ingredient", "chance": 50, "repeat": [ 1, 3 ] }, { "item": "sugar_various", "chance": 20 } ],
         "{": { "item": "bakery_dairy", "chance": 75, "repeat": [ 1, 2 ] }
       },
       "place_items": [
@@ -114,6 +114,10 @@
         { "item": "jackets", "x": 12, "y": [ 18, 19 ], "chance": 75, "repeat": [ 1, 3 ] },
         { "item": "baked_goods", "x": 5, "y": [ 5, 8 ], "chance": 75, "repeat": [ 1, 3 ] },
         { "item": "groce_softdrink", "x": 17, "y": 4, "chance": 35 }
+      ],
+      "place_loot": [
+        { "item": "baking_book", "x": 3, "y": 16, "chance": 40 },
+        { "item": "chocolate", "x": 2, "y": 16, "chance": 75, "repeat": [ 3, 7 ] }
       ]
     }
   },