Initial implementation of monster classes. Will be used for skills, resistances and...

Initial implementation of monster classes. Will be used for skills, resistances and categorizing of monsters. Should be read from resource file (not done yet).

Added splatter images when the player kills monsters, that will stay on the map for 20 seconds after a monster has been killed. Splatter images are however currently disabled, since the splatter type should be determined from the monster class (which is not yet fully implemented).

git-svn-id: https://andors-trail.googlecode.com/svn/trunk@214 08aca716-68be-ccc6-4d58-36f5abd142ac