CB7 libraries for Go

Both are pure Go and read-only; Go has no maintained 7z writer:

• sevenzip (github.com/bodgit/sevenzip) mirrors archive/zip: OpenReader, a File slice and f.Open(). It implements fs.FS and handles solid archives efficiently by reusing the decompressor when you read files in order.
• archives (github.com/mholt/archives) wraps sevenzip with a format-independent fs.FS, so the same code opens CBZ and CBR.

To create comics, write CBZ with archive/zip.

• archives Read CB7 comic book archives in Go with mholt/archives: open the 7z file as an fs.FS, list pages in natural order, extract the cover, read ComicInfo.xml.
• sevenzip Read CB7 (7z) comic book archives in Go with bodgit/sevenzip: pure Go, archive/zip-style API. List pages in natural order.