Add option to create chat from text file

[plonsik]

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• [X] I have checked the issue page for duplicates
• [X] I am running the latest version (download here)

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As in title. My streamer does not public his vods, im saving chat logs with my script - i would like to convert it back to chat :)

[Coldblackice]

Would also love this function, especially as it'd unlock being able to use chat logs from Chatterino merged with Twitch clips/VODs.