[WISH] provide identify function or rewrite encoding?

[Oldes]

Currently there is encoding? function, which returns the media codec name for given binary data.
Problem with this function is, that it requires to have the codec already imported. But there is quite a lot codecs, which are not imported by default, because are not much used. Like SWF or PLIST codecs.

When the codec is not imported, using for example load %some.swf would fail, because encoding? does not recognise swf file.

So there should be a function, which may guess the file type without need to have the codec, and if it finds such a file, it could import the codec's code, so the file could be decoded.