Update 1.0.4 - Content Drop + New Trade System — Citystate Steam update #796890

This is the first chapter of the "4 weeks 4 updates"! 3 new buildings to unlock - Airport: gives a boost to the upper class growth - Theme Park: raises the level of quality of life - University: helps to increase the education score Improved trade system - Dynamic commodity price: goes up when you have to import a lot, goes down when you export a lot. Influenced by the stock market index too. - Minerals are now exhaustible: each mine has a finite amount of ressources. Fixes - Issues add up more often - Middle income households have more chance to move in. - Help messages about traffic capacity and slums have been fixed. - Bankrupt has been fixed. - Bonds amount is no more doubled. - It's not possible to build anything anymore when running out of cash. - Minors UI changes and fixes. Compatibility with saved games: - New buildings are only available with new games. - Previous States relyin...