Bigger UI Controls

Hi there,

It would be nice if one could change the size of various Editor-UI controls. This would be very helpful for people (like me for example) who have a custom (especially smaller) DPI.

In addition it might help people with bigger hands to handle the UI more precisely.

I was hoping for this feature to be included for a while now, but as because nobody requested it I thought I'll do the first steps.

Thanks in advance and keep up the good work!