Add wxFont::Underlined() and MakeUnderlined() methods.

Add two more helpers for consistency with the existing methods such as Bold()
and MakeBold().

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@67051 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/font.h

@@ -574,6 +574,15 @@ public:
      */
     wxFont Smaller() const;
 
+    /**
+        Returns underlined version of this font.
+
+        @see MakeUnderlined()
+
+        @since 2.9.2
+     */
+    wxFont Underlined() const;
+
     /**
         Changes this font to be bold.
 
@@ -616,6 +625,15 @@ public:
      */
     wxFont& MakeSmaller();
 
+    /**
+        Changes this font to be underlined.
+
+        @see Underlined()
+
+        @since 2.9.2
+     */
+    wxFont& MakeUnderlined();
+
     /**
         Changes the size of this font.