cargo-cache is a Cargo plugin that allows to display information on the cargo
cache (`~/.cargo/` or `$CARGO_HOME`). Optional cache pruning.

Key Features:
* check the size of the cargo cache and its components (cmd: `cargo cache`)
* do a simple cleanup removing checkouts but keeping original files needed for
  reconstruction on disk (`--autoclean`)
* clean up everything (cargo will re-download as needed)
* dry-run to see what would be removed (`--dry-run`)
* recompress git repos (`--gc`)
* search cache via regex queries (`cargo cache query "reg.*x"`)
* print crates that take the most space (`--top-cache-items`)
* alternative registries supported
* remove files older or younger than X (`--remove-if-{older,younger}-than`)
* builds and runs on `stable`, `beta` and `nightly` channel
* purge cache entries not unused to build a specified crate (`cargo cache
  clean-unref`)
* print size stats on a local sccache build cache  (`cargo cache sc`)
* verify extracted crate sources (`cargo cache verify`)
