use wstrings uncoditionally where needed

src/clock.h

@@ -34,7 +34,7 @@ class Clock : public Screen<NC::Window>
 		virtual void Resize();
 		virtual void SwitchTo();
 		
-		virtual std::basic_string<my_char_t> Title();
+		virtual std::wstring Title();
 		
 		virtual void Update();
 		virtual void Scroll(NC::Where) { }