Feature: Add option to PrettyPrinter\Standard to print raw values for Int/Float scalars

[Girgias]

While working on https://github.com/Girgias/stub-to-docbook I came across a normalization from the pretty printer that I don't want.
Namely, the "normalization" of scalar values (in particular int and float) e.g. 0xFF being converted to 0xff and 2.4578e12 being expanded to 2457800000000.0.

This is easily fixed on my side, but was wondering if this should be an option for the standard pretty parser or not?