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Refactor things a wee bit to add a decoder struct. This doesn't really
do anything right now, but will be needed to add options, such as
"strict mode" in #197 or "extended errors" in #299.
Also add DecodeFS() as a companion to DecodeFile() to read from a fs.FS,
and since using a reader is the default with NewDecoder() (and was
already easy to do before with strings.NewReader()) I marked
DecodeReader() as deprecated.