Add stacktrace to main thread warnings when debug is enabled

Add SyncExperience feature

add import/export itemshop and vehicleshop commands and removed foreign keys from tables

Fix uploaditemshop adding skins to the itemshop table with empty names (now it won't add them, cuz they aren't actual items)

Fix selling items with the same buy price as sell price

Fix vehicle shop

fix for 3.24.4.0 update (error after level loaded)