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support alpha in VP8/VP9 WebM

Steve Lhomme requested to merge robUx4/vlc:vp89-alpha-level into master

Alternative version of !3600 (closed) with less FourCC (only one for each alpha bitstream that is not decodable by a regular VP8/VP9 decoder, at least for VP8).

The i_level value is currently not used by VP8/VP9 so a flag is set in there to detect regular VP8/VP9 from VP8/VP9 with alpha.

IMO it impacts way too much code to avoid decoding VP8/VP9 with alpha in decoders that will just discard it.

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