support chinese window's title and non-unicode wchars on screen

However, chinese is not fully supported, since some caracters are still missing. For example: 汉
To support these missing caracters, the atlas font defined in ui_atlas.cpp must be re-built. But the building tool: "atlastool" and its source code in native\tools\atlastool are not fully provided and thus impossible to be compiled.
Hope this issue could be fixed in the next official update.