Screenshots Overwrite One Another

Just a suggestion for something to look at fixing in the next version, but currently if you take screen shots in a game and then start a new game and take more screen shots it will overwrite the original. There's an old resource from 2006 with a bit of a hacky way of fixing this, but it would be nice to address it properly. Basically, it looks like the variables in Common/gamescripts/screenshots.cs aren't stored, so it starts fresh everytime the program is reloaded... that and the actual screenshot code doesn't check if a file exists before overwriting it (which is how the aforementioned resource tries to fix this).