fix more typos in returned states after conversion, temporarily disable metadata callback until ogg page rewriter is finished and hooked up

revamp OggFLAC__SeekableStreamEncoder to derive from FLAC__StreamEncoder instead of FLAC__SeekableStreamEncoder

various fixes related to deriving OggFLAC__SeekableStreamEncoder from FLAC__StreamEncoder instead of FLAC__SeekableStreamEncoder

various fixes related to deriving OggFLAC__SeekableStreamEncoder from FLAC__StreamEncoder instead of FLAC__SeekableStreamEncoder

add comment for flac-tools link, add links for archive.org, move "communities" section between "hardware" and "software" section

revamp ogg flac file decoder; it needed to be derived from the ogg flac stream encoder instead of the flac file encoder

fix up reporting of the current frame to the write callback; also fixes a problem with progress callbacks in the ogg flac file encoder