doc: mention magnum-player, add screenshots to the Utility page.

Doxyfile

@@ -952,7 +952,8 @@ EXAMPLE_RECURSIVE      = NO
 
 IMAGE_PATH             = doc/ \
                          doc/snippets/ \
-                         ../magnum-examples/doc
+                         ../magnum-examples/doc \
+                         ../magnum-extras/doc
 
 # The INPUT_FILTER tag can be used to specify a program that doxygen should
 # invoke to filter for each input file. Doxygen will invoke the filter program

doc/utilities.dox

@@ -27,7 +27,27 @@ namespace Magnum {
 /** @page utilities Utilities
 @brief Utilities for system information, data conversion, multimedia apps
 
-The following command-line utilities are available:
+@section utilities-gui GUI apps
+
+@m_class{m-row m-container-inflate}
+
+@parblock
+
+@m_div{m-col-m-4 m-push-m-2 m-col-s-6 m-text-center}
+@image html player.jpg
+@subpage magnum-player @m_class{m-label m-default m-flat} **live web demo**
+\n @copybrief magnum-player
+@m_enddiv
+
+@m_div{m-col-m-4 m-push-m-2 m-col-s-6 m-text-center}
+@image html ui-gallery.png
+@subpage magnum-ui-gallery @m_class{m-label m-default m-flat} **live web demo**
+\n @copybrief magnum-ui-gallery
+@m_enddiv
+
+@endparblock
+
+@section utilities-cli Command-line utilities
 
 -   @subpage magnum-gl-info @m_class{m-label m-default m-flat} **live web demo** --- @copybrief magnum-gl-info
 -   @subpage magnum-al-info @m_class{m-label m-default m-flat} **live web demo** --- @copybrief magnum-al-info
@@ -35,9 +55,5 @@ The following command-line utilities are available:
 -   @subpage magnum-fontconverter --- @copybrief magnum-fontconverter
 -   @subpage magnum-imageconverter --- @copybrief magnum-imageconverter
 
-The following graphical apps are available:
-
--   @subpage magnum-ui-gallery @m_class{m-label m-default m-flat} **live web demo** --- @copybrief magnum-ui-gallery
-
 */
 }