viewer: display mesh name in log.
viewer: display mesh name in log.

Also modify the output so it doesn't look like the optimization takes
whole time (the import does).

mosra/magnum-examples,mosra/magnum-examples,mosra/magnum-examples,Squareys/magnum-examples,Squareys/magnum-examples,mosra/magnum-examples,mosra/magnum-examples,mosra/magnum-examples,Squareys/magnum-examples,mosra/magnum-examples,Squareys/magnum-examples