added decref'ing of the created meshwrapper, now simple2 also cleanly unloads the 3d meshobject factory plugin
added decref'ing of the created meshwrapper, now simple2 also cleanly unloads the 3d meshobject factory plugin


git-svn-id: 28d9401aa571d5108e51b194aae6f24ca5964c06@8039 8cc4aa7f-3514-0410-904f-f2cc9021211c

crystalspace/CS,crystalspace/CS,crystalspace/CS,crystalspace/CS,crystalspace/CS,crystalspace/CS,crystalspace/CS,crystalspace/CS