More detailed errors from file parsing #31
Description
Currently file parsers are a complete black-box (or are supposed to be, sometimes I forget an unwrap somewhere.) This is because they only return an Option and not a Result. This should change at some point, because it's pretty much impossible to gauge what went wrong when parsing fails.
The naive solution is to add a binrw::Error to ParsingError, but I'm unsure if that's the correct one to go with.