Use floff to consistently generate correctly rounded results

[mborland]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (bef2775) 92.17% compared to head (3293512) 92.30%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #164      +/-   ##
===========================================
+ Coverage    92.17%   92.30%   +0.12%     
===========================================
  Files           64       64              
  Lines         8321     8316       -5     
===========================================
+ Hits          7670     7676       +6     
+ Misses         651      640      -11     

Files	Coverage Δ
include/boost/charconv/detail/dragonbox/floff.hpp	73.60% <100.00%> (+0.85%)	⬆️

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