/**
Sets the RGB intensity values using the given values (first overload),
extracting them from the packed long (second overload), using the given
- string (third overloard).
+ string (third overload).
When using third form, Set() accepts: colour names (those listed in
wxColourDatabase), the CSS-like @c "rgb(r,g,b)" or @c "rgba(r,g,b,a)" syntax