[2020] Number of clicks required to set combinator/logistics requests seems unnecessary. GUI suggestion for improvement

As you probably know, we actually implemnted this already few days ago.

I was actually suggesting to only show the item selection part only when the item isn't selected yet, so the item selection window isn't in your way when you are only updating the count. But, at least for now, it was decided to keep it this way for consistency.

I also had problem with the slider, it contained so many values (0 to 10 .. 20 to 100 .. 200 to 1000 etc), that it was impossible to get the precise value you typically wanted (some small amount of stacks). I was using the textboxes almost always, rending the slider close to useless.

So additional Qol (I believe) is, that the slider now has only 10 values with notches for 0 to 10 stacks of the item. This way, the slider actually is useful for something, as special values can still be specified using the textboxes.