signs persisting through load/save

src/net/torvald/terrarum/itemproperties/Item.kt

@@ -7,7 +7,6 @@ object Item {
 
     const val TREE_STICK = "item@basegame:18"
 
-    const val TREE_SEED_OAK = "item@basegame:160"
-    const val TREE_LOGS_OAK = "item@basegame:168"
+    const val COPPER_SIGN = "item@basegame:33280"
 
 }

src/net/torvald/terrarum/itemproperties/ItemCodex.kt

@@ -84,6 +84,8 @@ class ItemCodex {
         get() = CommonResourcePool.getAsTextureRegion("itemplaceholder_24") // copper pickaxe
 
     /**
+     * Unused IDs are purged when the game saves, as only the active entries are written to the savegame.
+     *
      * @param: dynamicID string of "dyn:<random id>"
      */
     fun registerNewDynamicItem(dynamicID: ItemID, item: GameItem) {