Library disc API: Disc, Title, Stream with typed codec/hdr/color

Clean public API for disc scanning. CLI should only display,
never parse binary formats directly.

Disc::scan() → titles → streams with:
 codec (Hevc/TrueHd/Ac3/Pgs/etc), pid, language,
 resolution, frame_rate, channels, hdr, color_space,
 secondary flag, label

src/lib.rs

@@ -53,4 +53,4 @@ pub use profile::{DriveProfile, Chipset};
 pub use platform::{Platform, DriveStatus};
 pub use scsi::ScsiTransport;
 pub use speed::DriveSpeed;
-pub use disc::{Title, Clip, Extent};
+pub use disc::{Disc, Title, Stream, StreamKind, Codec, HdrFormat, ColorSpace, Extent};