Adds support for utf paths on Windows.

Not all file formats/calls are supported yet. It will be expended.

Please from now on use BLI_fopen, BLI_* for file manipulations.
For non-windows systems BLI_fopen just calls fopen.
For Windows, the utf-8 string is translated to utf-16 string in order to call UTF version of the function.

intern/utfconv/utf_winfunc.h

@@ -0,0 +1,44 @@
+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version. 
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2009 Blender Foundation.
+ * All rights reserved.
+ * 
+ * Contributor(s): Alexandr Kuznetsov, Andrea Weikert
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+#ifdef WIN32
+
+
+#include "utfconv.h"
+#include <stdio.h>
+
+FILE * ufopen(const char * filename, const char * mode);
+int uopen(const char *filename, int oflag, int pmode);
+int urename(const char *oldname, const char *newname );
+
+char * u_alloc_getenv(const char *varname);
+void  u_free_getenv(char *val);
+
+int uput_getenv(const char *varname, char * value, size_t buffsize);
+int uputenv(const char *name, const char *value);
+
+int umkdir(const char *pathname);
+
+#endif