listing the supported file formats

Hello, I've recently started doing more in-depth development with Freetype2 and I was wondering if there was a way to list, or build a list of, the file formats supported by freetype or any extended modules when supplying a filepath to `FT_New_Face()`.

If freetype doesn't support a format, I would like to avoid calling `FT_New_Face()` entirely, rather than receiving an error for an unsupported format. :)

If you could also improve the documentation to describe this process, it would be very helpful to avoid errors entirely. :)
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