All classes moved to MeshTools::Implementation namespace and removed
from Doxygen output. They now all return tuples instead of custom
structures. Updated and improved documentation, removed references to
implementation classes.
Algorithm used: Pedro V. Sander, Diego Nehab, and Joshua Barczak, Fast
Triangle Reordering for Vertex Locality and Reduced Overdraw, SIGGRAPH
2007, http://gfx.cs.princeton.edu/pubs/Sander_2007_%3ETR/index.php
Also created new shared MeshTools library.