Porting PHPBB themes to MyBB

[Vitiman]

Essentially, "Evening Chill" is the original slightly modified port of my phpBB theme that Hypernova made. It's arguably prettier (even if he egregiously changed certain icons without my consent) because it uses a fake blur effect, but this evidently slows down certain hardware, so a version without the blur effect was made called 'Evening Chill Legacy", named as such because my original theme didn't have a blur effect to begin with.