短命令行参数解析 (deprecated)

示例：

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import std.argopt.*

main() {
    let shortArgs: Array\<String\> = ["-a123", "-bofo", "-cccc"]
    let shortArgName: String = "a:b:c"
    let longArgName: Array\<String\> = Array\<String\>()
    let ao: ArgOpt = ArgOpt(shortArgs, shortArgName, longArgName)
    println(ao.getArg("-a") ?? "None")
    println(ao.getArg("-b") ?? "None")
    println(ao.getArg("-c") ?? "None")
}

运行结果：

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123
ofo
None