set attributes in Menu::Refresh() by operators<<()

this also makes Window::{Bold,UnderLine,Reverse,Altcharset} private.
these should only be called by internals of Window class.

src/menu.h

@@ -737,10 +737,10 @@ template <typename T> void NCurses::Menu<T>::Refresh()
 			continue;
 		}
 		if ((*itsOptionsPtr)[i]->isBold)
-			Window::Bold(1);
+			*this << fmtBold;
 		if (highlightEnabled && int(i) == itsHighlight)
 		{
-			Reverse(1);
+			*this << fmtReverse;
 			*this << itsHighlightColor;
 		}
 		if ((*itsOptionsPtr)[i]->isSelected && itsSelectedPrefix)
@@ -753,10 +753,10 @@ template <typename T> void NCurses::Menu<T>::Refresh()
 		if (highlightEnabled && int(i) == itsHighlight)
 		{
 			*this << clEnd;
-			Reverse(0);
+			*this << fmtReverseEnd;
 		}
 		if ((*itsOptionsPtr)[i]->isBold)
-			Window::Bold(0);
+			*this << fmtBoldEnd;
 		line++;
 	}
 	Window::Refresh();

src/window.h

@@ -469,26 +469,6 @@ namespace NCurses
 			///
 			class BadSize { };
 			
-			/// Sets state of bold attribute (internal use only)
-			/// @param bold_state state of bold attribute
-			///
-			void Bold(bool bold_state) const;
-			
-			/// Sets state of underline attribute (internal use only)
-			/// @param underline_state state of underline attribute
-			///
-			void Underline(bool underline_state) const;
-			
-			/// Sets state of reverse attribute (internal use only)
-			/// @param reverse_state state of reverse attribute
-			///
-			void Reverse(bool reverse_state) const;
-			
-			/// Sets state of altcharset attribute (internal use only)
-			/// @param altcharset_state state of altcharset attribute
-			///
-			void AltCharset(bool altcharset_state) const;
-			
 			/// Sets colors of window (interal use only)
 			/// @param fg foregound color
 			/// @param bg background color
@@ -559,6 +539,26 @@ namespace NCurses
 			Border itsBorder;
 			
 		private:
+			/// Sets state of bold attribute (internal use only)
+			/// @param bold_state state of bold attribute
+			///
+			void Bold(bool bold_state) const;
+			
+			/// Sets state of underline attribute (internal use only)
+			/// @param underline_state state of underline attribute
+			///
+			void Underline(bool underline_state) const;
+			
+			/// Sets state of reverse attribute (internal use only)
+			/// @param reverse_state state of reverse attribute
+			///
+			void Reverse(bool reverse_state) const;
+			
+			/// Sets state of altcharset attribute (internal use only)
+			/// @param altcharset_state state of altcharset attribute
+			///
+			void AltCharset(bool altcharset_state) const;
+			
 			/// pointer to container used as history
 			std::deque<std::wstring> *itsHistory;