Run rustfmt and fix warnings

[pheki]

Most warnings were about deprecated fns, but some were about unused arguments in other platforms.

Two unused fn warnings remained, used only in #[cfg(any(target_os = "linux", target_os = "android"))] fns, and I'm not sure what to do about them:

flush_input_from_file and get_value_from_file

Thanks for your time!

[rust-highfive]

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[nastevens]

@pheki The warnings you're seeing are because those are private functions that are only used by other functions with #[cfg(any(target_os = "linux", target_os = "android"))] applied. It should be fine to add #[cfg(any(target_os = "linux", target_os = "android"))] to the flush_input_from_file and get_value_from_file functions

[pheki]

@nastevens Done!

I've also added .DS_Store to the .gitignore, which is a file sometimes created by macOS with directory metadata. I didn't think it was worth of another PR, but I'm willing to create it.

[nastevens]

Thanks!