Stop Keeping Tool Repositories Around about mint HOT 5 CLOSED

@yonaskolb, you can get the version list from git ls‐remote --tags without recloning the whole repository.

(All you have to do is sort the versions.)

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This would also resolve #12 in a brute force way.
What we would lose out on is the download time each time you update, but I guess Swift PM projects aren't usually that big so it's not a huge issue

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One question to consider now though is what happens when mint run is called without a specific version. Because we don't have the repo cached we can't get the latest tag, which means the whole repo will have to be downloaded again.

We either leave it like this, or assume "master" which make the behaviour different from run and install/update

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I think I'm just going to leave it as it is and document that leaving the version out will require a git clone

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See here for a full implementation if you want to use git ls-remote.

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