`e` in commits view should `git show`

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In the commits view, after you press enter on a commit, you can then press `e` to edit each individual file. \
Unfortunately, you go and edit the *actual* file, while it would be a lot more useful to edit the file *at that commit*. \

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`git show hash:path` can be used for this! :)

The reasoning for the idea, is that you can already press `e` to edit files as they actually are, when in the status view; there doesn't seem to be a convenient way to open a file at some certain commit (you don't always want to checkout)

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