refactor: mylib 重命名为 libs

更清晰的目录命名，libs/ 存放内嵌的独立协议实现库。

libs/grdp/protocol/t125/gcc/gcc_test.go

@@ -0,0 +1,13 @@
+package gcc
+
+import (
+	"bytes"
+	"testing"
+)
+
+func TestClientCoreDataDoesNotExposeClientName(t *testing.T) {
+	data := NewClientCoreData()
+	if !bytes.Equal(data.ClientName[:], make([]byte, len(data.ClientName))) {
+		t.Fatalf("client name is not empty: %x", data.ClientName)
+	}
+}