feat: Implement shapeless 2x2 and 3x3 crafting recipes

README.md

@@ -17,6 +17,7 @@ The following features are already working:
 - [X] breaking and placing blocks
 - [X] block interaction (right-clicking, e.g., to open doors)
 - [X] player inventory
+- [X] crafting, both 2x2 and 3x3 (however, not all recipes are supported, yet)
 - [X] chat
 - [X] commands (in-game and via an interactive console)
 - [X] configuration via server.properties

src/copybooks/DD-CALLBACK-WINDOW-SET-SLOT.cpy

@@ -4,3 +4,4 @@
 01 LK-INDEX                 BINARY-SHORT.
 01 LK-SLOT.
     COPY DD-INVENTORY-SLOT REPLACING LEADING ==PREFIX== BY ==LK==.
+01 LK-SYNC-REQUIRED         BINARY-CHAR UNSIGNED.

src/copybooks/DD-RECIPES.cpy

@@ -0,0 +1,15 @@
+*> --- Copybook: crafting recipes ---
+
+78 RECIPES-SHAPELESS-CAPACITY VALUE 1000.
+
+01 RECIPES EXTERNAL.
+    02 RECIPES-SHAPELESS.
+        03 RECIPES-SHAPELESS-COUNT BINARY-LONG UNSIGNED.
+        *> For efficient lookup, shapeless recipes store their ingredients sorted by item protocol ID (descending),
+        *> where ingredients occuring multiple times are repeated, and everything is padded with trailing zeroes.
+        03 RECIPE-SHAPELESS OCCURS RECIPES-SHAPELESS-CAPACITY TIMES.
+            04 RECIPE-SHAPELESS-INPUTS.
+                05 RECIPE-SHAPELESS-INPUT OCCURS 9 TIMES BINARY-LONG UNSIGNED.
+            04 RECIPE-SHAPELESS-OUTPUT.
+                05 RECIPE-SHAPELESS-OUTPUT-ID BINARY-LONG UNSIGNED.
+                05 RECIPE-SHAPELESS-OUTPUT-COUNT BINARY-LONG UNSIGNED.