New game mode: Barbarian Raids ("tower defense" mode)

Hi guys,

new update 1.0.50 has been released

this update contains new game mode: Barbarian Raids

bugfixes and improvements:
!+ improved catapults AI
!+ fixed buildings issues
!+ fixed price for the first belfry
!+ fixed smoke after buildings/walls
!+ fixed many small bugs
+ removed objects titles on the map (config: view_map_object_titles)