v0.7-458 and a small change of plans — Towers of Scale Steam update #5932219

Let's first start with the changelog:Fixed a possible issue with steam API that could potentially happen on game's exit. Probably this doesn't change anything in practice, but still.Fixed bugged calculation of the "master keys used" stat.Okay, and now let's go for the change of plans. Don't worry, I am not going on a hiatus or anything like that - it's just I got pretty hard stuck on designing the EX-4 stage, to the point that it is currently very difficult for me to make any progress on making the stage. And by any progress, I mean this literally - I am just staring at the screen of my computer and I am not able to do pretty much anything regarding this stage at the current moment.Now, that doesn't mean this stage is canned - I just put it temporarily on pause, while I go and make the 3-2 stage - a stage for which I have a pretty good idea on how it is supposed to work and what minor me...