msvcrt: Use Dragon4 algorithm to fix inconsistent rounding behaviour for sprintf and add tests.

[YongHao Hu]

Fix bug https://bugs.winehq.org/show_bug.cgi?id=37913 .
The Dragon4 algorithm implementation is based on 
http://www.ryanjuckett.com/programming/printing-floating-point-numbers/.

---
  dlls/msvcrt/dragon4.h         | 670 
++++++++++++++++++++++++++++++++++++++++++
  dlls/msvcrt/printf.h          |  43 +--
  dlls/msvcrt/tests/printf.c    |  83 +++++-
  dlls/msvcrt/wine_printfloat.h | 248 ++++++++++++++++
  4 files changed, 1026 insertions(+), 18 deletions(-)
  create mode 100644 dlls/msvcrt/dragon4.h
  create mode 100644 dlls/msvcrt/wine_printfloat.h


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