Tribes update

We just released an update to improve the tribes system!

There is no need for a client update as these changes are only server side. Here are the list of changes: Improvements to tribes: - they now properly react on an attack of a tribe member - they defend the village when a building is attacked - tribe villages can now be destroyed completely and respawn - when respawning they can choose a new random location (based on predefined ones) - added possibility to check for tribe village destruction in quests - added first quest to vanquish a tribe - improved a bit the logic when a tribe member cannot complete a task Improved the way an NPC searches for a navigable point, excluding impossible to reach ones