Global parameters before verbs

So I want to do something like this:
```bash
$ app.exe
```
First argument is a value, and I want to make it global for every verb in app. For now it is implemented like this:
```c#
abstract class BaseOptions
{
[Value(0)]
public string file { get; set; }
}

[Verb("verb1")]
class Verb1Options : BaseOptions
{
[Option('a', "verb-1-option")]
public bool a{ get; set; }

[Option('b', "verb-1-another-option")]
public bool a{ get; set; }
}

[Verb("verb2")]
class Verb2Options : BaseOptions
{
[Option('c', "verb-2-option")]
public bool c{ get; set; }
}
```
But the issue is first goes verb then value. I need in reverse Can I do it?

首先追踪 parser 如何处理 verb 选择和位置参数 Value 属性，并以 issue 中的命令示例和 BaseOptions 层次结构作为行为参考。当文件路径位于 verb 之前的调用能够成功解析，并且该值可供每个 verb 使用，同时不破坏 verb 专用选项时，即表示完成。

由索引模型根据 Issue 内容生成。