Refactor format backend args handling
Refactor format backend args handling

Keep the format backend argument handling isolated to the command.

nuance/GoTools,bparees/GoTools,liggitt/GoTools,stevekuznetsov/GoTools,liuhewei/gotools-sublime,ironcladlou/GoTools,Mistobaan/GoTools,ironcladlou/GoTools,Mistobaan/GoTools,bparees/GoTools,stevekuznetsov/GoTools,nuance/GoTools,liggitt/GoTools