Added slide on steep ramps.
Handle vertical collision with faces > 45 degrees as collision to avoid the player to climb steep ramps
Reverting to r2160, before failed AI attempts to improve collision detection
Improvements in collision detection to avoid traversion and locking
General fixes in collision detection
Now the merchant refuses to buy some itens; Fixed some multilanguage issues
Reward of last quest changed from 5.000 gold to 60.000.
Fixed jump to a more realistic behaviour.