msvcrt: Use Dragon4 algorithm to fix inconsistent rounding behaviour for sprintf and add tests. The Dragon4 algorithm implementation is based on http://www.ryanjuckett.com/programming/printing-floating-point-numbers/.

[YongHao Hu]

Try 3:
- Superseded Patch 109456.
- Use appropriate win32 types instead of typedef.
    (Thanks Dmitry Timoshkov)

Try 2:
- Superseded Patch 109432
- Use typedef instead of C99 types
- Delete useless #ifndef
- Add memset to test

Try1:
- 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         | 668 
++++++++++++++++++++++++++++++++++++++++++
  dlls/msvcrt/printf.h          |  43 +--
  dlls/msvcrt/tests/printf.c    |  96 ++++++
  dlls/msvcrt/wine_printfloat.h | 246 ++++++++++++++++
  4 files changed, 1036 insertions(+), 17 deletions(-)
  create mode 100644 dlls/msvcrt/dragon4.h
  create mode 100644 dlls/msvcrt/wine_printfloat.h


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