Hotfix v0.30.3

Hi folks! This is a quick hotfix build with fixes for issues reported from the Volcanic Update two days ago.

Changes:

• Fixed a couple of broken "Volcanic" modular building tiles. Any affected buildings should automatically be fixed when loaded in 0.30.3 or later!
• Fixed a multithreading bug which could sometimes result in a crash after exiting from the game simulation to the ingame desktop interface.
• Fixed a multithreading bug which could result in a softlock when the game starts up if you configured the game to run using only a single worker thread; turns out that we need at least two worker threads during startup! (I'll be looking at this more in the future, but for this hotfix I've just changed the options system to not allow the number of worker threads to be configured below 2)
• Fixed an issue which could result in a crash if you took away a pull attack (for example, by raising its minimum level to be learned) from someone who was in the middle of using it.
• Fixed a critical bug with slider UI widgets.

Note about performance interaction with Discord

We're still seeing some players report surprising performance issues while running the game at the same time as Discord. This doesn't affect *everyone*, but it seems to most commonly affect people with high-end computers. When issues happen, the reported behaviour is usually about the game running well for a few minutes, but then having the game FPS tank to around 10 or below for 10-20 seconds, and then going back to running well for a few minutes before tanking again in a loop.

If that cycle of occasional bad performance is happening to you, the advice which has worked for other players has been to go into the Discord settings interface: In the Activities section, in the Game Overlay part, you need to make sure that both the "Overlay" and "Legacy Overlay" settings are turned off. Then, in the Registered Games part, find MMORPG Tycoon 2 and make sure to cross out both the Eye and the Monitor icons. With those four settings ("Overlay" and "Legacy Overlay" *off*, and MMORPG Tycoon 2's eye and monitor icons disabled), performance has returned to normal for everyone we've spoken to!

We're still actively trying to contact folks at Discord to figure out exactly what's causing this trouble, but for right now this is the workaround that we're recommending to folks affected by the issue!

-T