[Feature request] configurable list of extensions which are considered text files

[Hlib Rukavishnikov]

There are a lot of niche file formats which contain plain text. Right now I use the trick of adding .txt to all files, then removing it. But it is not convenient. I'd love if there was a config parameter somewhere in QuickLook.config, or maybe QuickLook.Plugin.TextViewer.config where I could add extensions which I want to preview as plain text.
P.S. thanks for a great tool. It is very handy