More menu work. Begin implementing an inventory system.

player.lua

@@ -19,6 +19,24 @@ function init_player()
    facing_v = 1
    facing_h = 0
 
+   -- constants for item IDs. Doubles as sprite indices.
+   item_mushroom = 64
+   item_cactus_meat = 65
+   item_wood = 66
+   item_cactus_flower = 80
+   item_berries = 81
+   item_cactus_meal = 66
+
+   -- inventory is a map of item ids to counts
+   inventory = {
+      item_mushroom = 0,
+      item_cactus_meat = 0,
+      item_wood = 0,
+      item_cactus_flower = 0,
+      item_berries = 0,
+      item_cactus_meal = 0
+   }
+
    -- this is a constant for looking up player sprites by facing
    player_lookup = {
       [0] = {