(SMesh): add default visibility configuration

What does this MR do?

• Add default visibility state in configuration of a mesh.
• Add a usage example of this feature in ExSimpleARCVOgre

How to test it?

• Build and launch ExSimpleARCVOgre
• Load the given data (camera calibration + video stream)
• You can see that the mesh plane is hidden by default
• You can show/hide it with the given toolbar button

Data

• https://owncloud.ircad.fr/index.php/f/894815

Additional tests to run

• Build on Windows
• Build on Linux