Improve mdin parsing to not split restraintmask fields using '=' wildcard char#1369
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The existing implementation of Amber mdin parsing splits fields at ',' and '=', but this causes issues with the restraintmask field that can use '=' for wildcards, e.g.
'!@H='would be used to do "don't restrain any H atom" (i.e. restrain only heavy atoms). So I've changed the splitting with regex and other checks for quoted field values.