Add support for alternative flag parsers - #1
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flagpackage by using an interface instead of directly depending onflag.FlagSet. Any type that provides methods such asStringVarcan now be used.BindTagmethod, allowing arbitrary struct tag names to be used."flag"パッケージ以外のオプションパーサーを利用できるように、"flag"のFlagSetを直接使わず、interface を使って、StringVarなどのメソッドを定義した型ならどれでも利用できるようにした。BindTagメソッドを追加し、任意の構造体タグ名を利用できるようにした。