oxidize shadow-rs

[Sebastian Thiel (Byron)]

• a whole lot of metadata extraction
• has feature toggles for CLI usage as well as git2, which is neat

Requirements

git2

• diff index with HEAD
• diff index with working tree (without untracked)
• is working tree clean (without untracked)
• current branch

git (CLI)

• find last tag with git describe --tags --abbrev=0 HEAD
• find current tag with git tag -l --contains HEAD

https://github.com/baoyachi/shadow-rs

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Original issue: #1036