Version v12b

Add: New monster, the evil turtle
Add: New option to pause the game when a caravan comes
Change: Werepig graphics now are isometric
Change: Pathfinding now adds a bit more importance to the Z level
Change: Removing an item with the contextual menu now reveals the cell under
Change: Now the game doesn't crash if for some reason a saved game file is not found
Fix: Following livings glitches and starts to wander off screen
Fix: Mod loader issue when a mod adds new terrain types
Fix: Buried architect's tables and hanged lamps are not sold by the merchants anymore