Archamon 2.0.20 beta update

!+ fixed population error after loading the game
!+ fixed diplomacy system (critical)
!+ fixed barbarian activity
!+ fixed lumberjack function
!+ fixed menu sound
!+ fixed incorrect connection of corner walls
!+ fixed rounding in barbarian requests
!+ fixed incorrect window size on the first launch
+ revision of the use of automatic top menu switcher
+ optimization of object selection on the map
+ changed maximum camera altitude