Add Glyph.advance()

src/dft/package.d

@@ -59,6 +59,11 @@ class Font
             return m_dft_glyph.top;
         }
 
+        @property int advance()
+        {
+            return m_dft_glyph.advance;
+        }
+
         @property const(ubyte)[] bitmap()
         {
             int n_bytes = width * height;