Fixed servers stalling for up to ~200ms when a player crafts a workshop skinned item for the first time after a restart or steam definitions update
- The steam item definitions warmup now runs on the server too, it was client only so dedicated servers always read them cold
- Also warms WorkshopId, (HasWorkshopSkin reads it for every owned item and each cold read is a native Steamworks call)
- Moved SteamItemDefinitionWarmup out of the Client folder
7.81ms -> 0.07ms on first call