Implementation of the C++ from_chars functions for float and double types

 The fast_float library provides fast header-only
 implementations for the C++ from_chars functions
 for float and double types. These functions convert
 ASCII strings representing decimal valuesinto
 binary types. This library provides exact rounding
 (including round to even). These fast_float
 functions run many times faster than comparable
 number-parsing functions from existing C++ standard
 libraries.