We replaced most of std::cerr with global::cerr. windows.h is now
included from common.h. Before including it, we define WINVER. We
renamed some variable name because some macros in windows.h collide
with them.
In MinGW32 build, global::cout is WinConsoleFile. When outputing to
console, it uses WriteConsoleW, so Unicode characters are written.
Fixed memory leak in WChar<->MultiByte conversion functions. The
portion of code which uses std::cout is rewritten to use global::cout.
Nils Maier