Smaller input boxes in settings

[FWDekker]

The input boxes are currently way too large; the IntelliJ design guidelines says that they should be appropriately sized. Currently, for example, the integer range inputs span the whole width of the window, but even the maximum integer value doesn't get close to half the width of the input box. Therefore, it can safely be reduced to, say, half its width. This is true for most input fields.

This is important not just to comply with the design guidelines, but because it means users will have to move their eyes less. Currently, they have to look at the label, move their eyes all the way to the right to see the number, then all the way to the left for the next label, etc. While not a major issue, fixing this issue would slightly improve user comfort.