Added some fancy images to the interfaces overview page

git-svn-id: http://www.openflipper.org/svnrepo/OpenFlipper/branches/Free@5490 383ad7c9-94d9-4d36-a494-682f7c89f535

Doxygen/Interfaces.docu

@@ -55,6 +55,7 @@
  *
  *
  * \section TexturePlugin Texture Interface
+ * \image html TextureInterface.png
  * Allows your plugin to provide a texture. ( TextureInterface )
  *
  * \section PickingPlugin Mouse Picking / Pick Modes