Replace &'static str errors with a dedicated FontError type
#170
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Using
&'static strs for error is bad API design, as it makes it hard for calling code to determine what type of error has happened without becoming dependent on exact strings, and also because&'static strdoesn't implementstd::error::Error. This PR replaces the&'static strerrors with a dedicatedFontErrortype.If you don't want
thiserroradded as a dependency for some reason, I can amend the PR to implement the relevant traits manually instead.