Make PRs for cargo fmt and cargo fix

[oriongonza]

This will improve the overall quality of crates.

cargo fmt: Some crates don't use this. I don't think that's a good idea, it might be because they don't know.
cargo fix: This is generally good

It will also teach rust users about those commands.

[szabgab]

See #28 how to run these in a Docker container

[szabgab]

There is now an implementation of running cargo fmt, but it has a number of problems that still need to be addressed

• It is driven by the crates and when multiple crates are in the same repo it runs several times on the same repo
• It takes a lot of time - for some repositories it was 10 minutes

I also experimented with cargo fix. It downloads each one of the dependencies that makes is very slow.

• We might use the download caching of cargo, e.g. by using a docker volume.
• The duplicate run that was mentioned for cargo fmt needs to be eliminated here too