bugfix; adjustments

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bugfix

• 修复了若干个由Synk指出的漏洞
• 修复了一个 Executive 的逻辑错误导致短指令失效的bug
• fix #12

一些调整

• 当前版本帮助文本中不会显示已经禁用的指令响应器

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bugfix

• Fix some vulnerabilities pointed by Synk.
• Fix a logical error in Executive causing the responder could not called by short alias.
• fix #12