[FIXME] Remove cscope
Add brackets to if statements
Windows does not have langinfo codeset
Add MSVC definitions
Add if statement brackets
Add MSVC definitions
Disable security warnings in windows
Move OS specific bits into platform/

- os_unix.c/.h and equivalent msvc files now live
  in platform
- new abstract header os.h is included instead of os_*.h
Add brackets to if statements
Add MSVC definitions