Fix some warnings and typos in the codebase

[Abestanis]

This includes the changes of #90 and should be reviewed after merging it. I'll keep this as a draft until then.

This addresses a few warnings and typos that were reported in the codebase. I recommend reviewing this commit by commit.

[Abestanis]

Also, I don't know why the line endings are messed up again, just enable the Hide whitespace setting on GitHub when reviewing to help see the actual changes.