Get option as a range string. The string must be in the
format [!]<low>[:<high>] where low and high are guint values.
Values between low and high (both included) will be considered in
the range, unless ! is used to invert the range.
Parameters
option: string
the option identifier
Returns [boolean,string]
true if value has been set or false if the option doesn't exist
Get[!]<low>[:<high>] where low and high are ! is used to invert the range.
optionas a range string. The string must be in the formatguintvalues. Values between low and high (both included) will be considered in the range, unless