Micro-optimize RenderWidgetHasFocus().
Implement the "Rating" column.

Looks like I forgot to do this...
Cast the result of GetSize() to "unsigned long long".

Squelches a warning on Mac OS X.
Support HiDPI flags & rating images.

There aren't any yet, it's up to up to Stevoisiak and MaJoR to create
them :)
Fix HiDPI loading logic.