Add dragonbox to compute the required precision to print floating point
numbers. This avoids uglification of floating point numbers that
happen by default via std::stringstream.
Numbers like 34.34 used to be converted to '34.340000000000003' as strings.
With this version they will be converted to the string '34.34'.
This fixes issue https://github.com/jbeder/yaml-cpp/issues/1289
jekyll/liquid got hung up on `{{"Daniel", 26}, {"Jesse", 24}}`.
The reason is that `{{...}}` are used as variables that are replaced by
there values. In this case we have a YAML object that looks the same.
This issue can be fixed by surrounding the block into `{% raw %}...{%
endraw %}` tags.
The issue is that numbers like
2.01 or 3.01 can not be precisely represented with binary floating point
numbers.
This replaces all occurrences of 'std::numeric_limits<T>::digits10 + 1' with
'std::numeric_limits<T>::max_digits10'.
Background:
Using 'std::numeric_limits<T>::digits10 + 1' is not precise enough.
Converting a 'float' into a 'string' and back to a 'float' will not always
produce the original 'float' value. To guarantee that the 'string'
representation has sufficient precision the value
'std::numeric_limits<T>::max_digits10' has to be used.
