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/CMakeLists.txt

@@ -0,0 +1,24 @@
+set(INC
+	.
+)
+
+set(INC_SYS
+	${GLEW_INCLUDE_PATH}
+)
+
+set(SRC
+	utfconv.c
+
+	utfconv.h
+	#utf_func.h
+)
+
+
+if(WIN32)
+	list(APPEND SRC
+		utf_winfunc.c
+		utf_winfunc.h
+	)
+endif()
+
+blender_add_lib(bf_intern_utfconv "${SRC}" "${INC}" "${INC_SYS}")