common: use strtoul in parse_color to avoid clamp #831
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Some implementations of strtol may clamp the values to LONG_MAX instead of wrapping around to negative values, so use strtoul instead to parse colors.
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Some implementations of strtol may clamp the values to LONG_MAX instead of
wrapping around to negative values, so use strtoul instead to parse colors.
(Mentioned in #343)