Changes to unit upgrades and new dwarves

Warriors! Changes in version 0.8.4: - Two new dwarf units - Engineer and Elder. Now dwarfs are fully equipped! - redesigned the characteristic upgrades. Now the cost increases with each upgrade. Units with higher initial characteristics have cheaper upgrades; - the calculation of a unit's level depending on the spent experience is now linear. Every 200 experience spent increases a unit's level by 1; - visibility of enemy armies is calculated correctly. Previously used a temporary stall script; - automatic selection of the next unit during formation before the battle; - fixed several bugs, including a critical bug with the use of the "Impact" spell; - some other small things. WARNING: Old saves will not work! We apologize. Please add Veterum to your Steam wish-list, subscribe to the Discord channel and Twitter: https://discord.com/invite/ZEFE6KMVDw https://twitter.com/Vlad_Konung