Always show the Exit button, useful in fullscreen.

Fixes #1193.  Could make it conditional but doesn't hurt...
Don't try to analyze prx's either - tests.
Show up to 12 items in recent on Windows.

It's a tiny bit cluttered, and I know more is coming, but it's pretty
convenient for now...
Don't stretch icons for Minis, keep aspect.
Adjust spacing a bit to look less cluttered.
Fix drag and drop loading on Windows.
Merge pull request #1196 from unknownbrackets/ui-tweaks

Minor adjustments to the menu screen