Add an array with driver name strings for the driver enums.


git-svn-id: svn://svn.code.sf.net/p/irrlicht/code@4950 dfc29bdd-3216-0410-991c-e03cc46cb475
Cleaning up Meshviewer example. That was too confusing to use and the code got too long for one file.


git-svn-id: svn://svn.code.sf.net/p/irrlicht/code@4951 dfc29bdd-3216-0410-991c-e03cc46cb475
Improve const-correctness in meshviewer example.


git-svn-id: svn://svn.code.sf.net/p/irrlicht/code@4952 dfc29bdd-3216-0410-991c-e03cc46cb475