glbl Atom

Hi,

as discussed a while ago (also with people from ffmpeg), global
codec data should be stored in a glbl atom, if not otherwise
specified. This makes it possible to use non-official codecs
(like ffvhuff) in a generic way.

I added support for reading and writing codec data in the glbl
atom. It must be enabled per codec, right now only for ffvhuff.

The old (codec dependent) method using the FFVH atom is still
supported for decoding, but should be removed if Richard gives
his ok (don't know how many files he already encoded :)

Patching ffmpeg for the same behaviour should be trivial.

Burkhard

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