more features for non-interactive mode

[luogni]

I would like to use twitchy with rofi also for vod streams. An ideal api would be:

• twitchy --list-vod --number 50: this will list latest 50 vods from all your channels with an internal id (for ex. channelname/vod number)
• twitchy --play-vod vodid

Is it possible to do something like that?