[Feature Request] cabin remove

[Heus-Sueh]

For some reason this feature went unnoticed, I realized this now after having to remove the dependency from both .toml and the cache folder where the lib's git repository is cloned.

off-topic: you need to add a template for feature request

[ken-matsui]

I think remove command wouldn't generally remove the package from the cache. You can use clean for such use. Anyway, we can have remove for removing it from cabin.toml.

For feature request, you can make an issue/PR.