Refactor pkgver comparison algorithm

Arne Beerrequested to merge
enhance/pkgver-comparison into main

Resolves #39 (closed)

This MR cleans up the Pkgver comparison algorithm by

  • Implementing an Iterator over a Version's segments
  • Writing detailed inline documentation on the comparison algorithm
  • Converting the existing code into ideomatic Rust instead of C-style code

The MR is designed to be reviewed commit-by-commit

Edited by Arne Beer

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