* Character.cs:
* SimpleRoguelike.userprefs: 

* PlayerCharacter.cs: Made the player reference its present location
  as a tile object

* Race.cs: Removed the diet component of a race definition

* CombatConst.cs: Added a separate constant for evasion scaling

* Mechanics.cs: Added constants

* Game.cs: Started building some test-objects for moving the game to a
  contentless but runnable point.