oggmeta 1.0.0

A crate for reading and writing ogg metadata
Documentation 
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# oggmeta

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oggmeta is a crate that reads `.ogg` files and decodes the vorbis comments contained within.
### Features
oggmeta can read and write vorbis comments and theora comments within ogg files

in case the album art is contained as a theora frame, using `theorafile`, oggmeta can read the first frame of
video and store it as an album cover. 

NOTE: that implementation is pretty much completely wrong. ffmpeg does this by default when converting from, for instance, an mp3, but covert art in an ogg file should _always_ be stored in
`METADATA_BLOCK_IMAGE`. However, I don't want oggmeta to overwrite data in an ogg file (besides tags);
oggmeta will keep the theora stream, but will exclusively write album covers to 
`METADATA_BLOCK_IMAGE` tag.

### Limitations
regardless of how much video is in the file, oggmeta will always
assume there is only one frame of video and save the first one as an album cover.