Update for the lab rats — Little Square Things Steam update #59958

Rolling out some new little features for the lab rats in the experiments beta branch. There are new options, such as setting the window size (to, say,1x, 2x, etc.) and changing the speed of input "repeat" (when you hold a key). That also came with reorganizing the menus while trying to keep them as simple as possible. I'm definitely welcoming some feedback on that.