优化GUI物品读取方式，提高配置自由度

src/main/resources/plugin.yml

@@ -7,6 +7,15 @@ website: ${project.url}
 
 author: CarmJos
 
+commands:
+  "UltraDepository":
+    description: "超级仓库的主指令"
+    permission: "UltraDepository.use"
+    aliases:
+      - ud
+      - depository
+      - depositories
+
 permissions:
 
   "UltraDepository.use":
@@ -21,4 +30,10 @@ permissions:
 
   "UltraDepository.admin":
     description: "超级仓库的管理权限"
-    default: op
+    default: op
+
+  "UltraDepository.Command.Sell":
+    description: "超级仓库的出售指令权限"
+
+  "UltraDepository.Command.SellAll":
+    description: "超级仓库的出售全部指令权限"