This changes the open parent directory, open recent, and open folder
16x16 icons to be more consistent with the other folder icons. This
also improves the other elements on these icons by adding tinting
and shading.
I booted the system on a much better screen than the one I normally use
and the variance in contrast between different icons bothered me.
Here's an attempt to fix that, while also redoing some icons that I've
wanted to redo for a while. :^)