[1/n] [ci] update MSRV and test on it, add clippy, fix clippy warnings #70
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Clippy flagged an outdated MSRV -- update to the version currently in Omicron,
and add CI for the various permutations.
Also allow
/target
to be a symlink -- this is the setup I use.(We'll need to update the required CI jobs in the GitHub config.)