unset listchar before creating game windows

I suppose during OSGCC I didn't have any listchars set in vim, so this
didn't occur to me. however, the game relies heavily on spaces for its
graphics and they need to be blank.
stop using require_relative for now

whilre reuire_relative is great, it doesn't seem to work anymore whitout
some extra help. since I'm not sure what that is, I've temporarily
replaced all relative call qith just 'require' and the full project path