SQUASH: feat(pkuxkx): 增加对未知 GMCP 消息的支持，方便用户扩展

mud/pkuxkx/plugins/gmcp.tin

@@ -125,13 +125,15 @@ event.Define {GMCP.Message}     {无参} {$MODULE} {接收到 GMCP 聊天信息
 #alias {gmcp.pkuxkx.OnGMCP} {
     mudLog GMCP: {%1} {%2};
 
+    #line sub escapes #var gGMCP[Unknown] {%2};
+    #var gGMCP[Unknown][VarName] {%1};
+
     #if { @option.IsEnable{GMCPDebug} } {
-        #line sub escapes #var gGMCP[Unknown] {%2};
-        #var gGMCP[Unknown][VarName] {%1};
         warnLog 接收到未知的 GMCP 消息：%1，请联系开发者。以下为消息内容：;
         #var gGMCP[Unknown];
-        #unvar gGMCP[Unknown];
     };
+
+    event.Emit GMCP.Unknown {};
 };
 
 #alias {gmcp.pkuxkx.OnStatus} {