balrogg: lossless Vorbis/Opus recompressor

[FitGirl]

Thanks for a new tool. I've tested it a little. My Opus tests, while showing some result don't make it usable in real repacking - the gain is tiny, no solid mode support (yet?).

Test corpus: Wwise Opus converted to generic opus: 14440 files
Opus: 581718877 bytes
Ballroggs: 567165459 bytes

Since opus files don't have codebooks which could be stored once in a solid mode and where oggre does it's job good, with opus it won't work. And rn since ballrogg doesn't support solid mode, one can't expect big gain on a smaller files concatenated into one stream.

I also tested initial ballrogg v1.0 on vorbis files in single/solid mode. It compressed files fine in single mode, but with the same files concatenated it gave an error.

Will do more tests with fresh builds when I have time.
Unfortunately for repackers, Opus is already a very effective format, with it's range-coder near Shannon limit and space for improvement is really tiny.