io.styles: add using to all examples plus fix formatting in some examples
io.styles: add using to all examples plus fix formatting in some examples

bjourne/factor,mrjbq7/factor,AlexIljin/factor,mrjbq7/factor,dch/factor,bpollack/factor,dch/factor,nicolas-p/factor,dch/factor,slavapestov/factor,bjourne/factor,factor/factor,dch/factor,factor/factor,AlexIljin/factor,nicolas-p/factor,bjourne/factor,bjourne/factor,tgunr/factor,tgunr/factor,sarvex/factor-lang,dch/factor,bpollack/factor,bjourne/factor,factor/factor,bjourne/factor,mrjbq7/factor,nicolas-p/factor,sarvex/factor-lang,slavapestov/factor,bpollack/factor,bpollack/factor,AlexIljin/factor,AlexIljin/factor,sarvex/factor-lang,slavapestov/factor,tgunr/factor,sarvex/factor-lang,factor/factor,nicolas-p/factor,slavapestov/factor,mrjbq7/factor,bpollack/factor,AlexIljin/factor,AlexIljin/factor,nicolas-p/factor,slavapestov/factor,bpollack/factor,factor/factor,slavapestov/factor,AlexIljin/factor,bpollack/factor,tgunr/factor,slavapestov/factor,sarvex/factor-lang,tgunr/factor,mrjbq7/factor,tgunr/factor,sarvex/factor-lang,mrjbq7/factor,sarvex/factor-lang,bjourne/factor,nicolas-p/factor,nicolas-p/factor,factor/factor,dch/factor