Complete roguelike tutorial using C++ and libtcod - extra 3: scent tracking

Complete roguelike tutorial using C++ and libtcod -originally written by Jice Text in this tutorial was released under the Creative Commons Attribution-ShareAlike 3.0 Unported and the GNU Free Documentation License (unversioned, with no invariant sections, front-cover texts, or back-cover texts) on 2015-09-21.

part 1: setting up part 2: map and actors part 3: dungeon building part 4: field of view part 5: preparing for combat part 6: going berserk! part 7: the GUI part 8: items and inventory part 9: spells and ranged combat part 10.1: persistence part 10.2: game menu part 11: dungeon levels and character progression extra 1: about editors and IDE extra 2: debugging extra 3: scent tracking extra 4: makefiles extra 5: more generic items

This article is an optional "extra" that will bring scent tracking to the monster Ai. In can be applied on the article 6 source code.

Even with the wall sliding trick, the monsters are still quite dumb. We'll implement scent tracking so that they can track the player even when they don't see him.