listing the supported file formats

[tcll5850]

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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