added:

- file: bool fileExists
 - str: removed c++ string conversion
 - tracelog: added utf8 output for windows

tracelog.c

@@ -6,6 +6,7 @@
 
 #ifdef _WIN32 
     #pragma warning(disable:4996) // _CRT_SECURE_NO_WARNINGS.
+    #include "win32_slim.h"
 #endif
 
 #ifdef TLOG_VS
@@ -75,6 +76,10 @@ void traceLogVaList(int level, const char *fmt, va_list args) {
 
     vsnprintf(buffer + offset, sizeof(buffer) - offset, fmt, args);
 
+#ifdef _WIN32
+    SetConsoleOutputCP(CP_UTF8);
+#endif
+
 #ifdef TLOG_VS
     OutputDebugStringA(buffer);
     if(use_newline) OutputDebugStringA("\n");