hintbox/msgbox: add more specific thread names

For better tracing while debugging.

src/gui/widget/hintbox.h

@@ -320,6 +320,11 @@ optional disable/enable background
 
 class CHint : public CHintBox
 {
+	private:
+		void initHint(bool enable_bg)	{	paint_bg = enable_bg;
+											ccw_show_header = false;
+											ccw_show_footer = false;
+											cc_item_type.name = "wg.hint";}
 	public:
 		/**CHint Constructor
 		* @param[in]	Text