Revert "support 8bit bitmaps"
Revert "support 8bit bitmaps"

This reverts commit ac8075f30e5abdbc2c026e3f78bf1e506d2398e2.

mcandre/factor,kingcons/factor,erg/factor,bjourne/factor,tgunr/factor,bpollack/factor,factor/factor,kingcons/factor,sarvex/factor-lang,seckar/factor,ehird/factor,erg/factor,slavapestov/factor,sarvex/factor-lang,sarvex/factor-lang,dharmatech/factor,AlexIljin/factor,nicolas-p/factor,jwmerrill/factor,erg/factor,factor/factor,dch/factor,Keyholder/factor,bpollack/factor,mcandre/factor,dch/factor,mrjbq7/factor,dharmatech/factor,AlexIljin/factor,dharmatech/factor,seckar/factor,mrjbq7/factor,AlexIljin/factor,factor/factor,Keyholder/factor,dch/factor,jwmerrill/factor,bjourne/factor,mcandre/factor,slavapestov/factor,erg/factor,bpollack/factor,sarvex/factor-lang,erg/factor,factor/factor,erg/factor,nicolas-p/factor,AlexIljin/factor,nicolas-p/factor,bpollack/factor,ceninan/factor,ceninan/factor,mcandre/factor,ehird/factor,mcandre/factor,nicolas-p/factor,erg/factor,dch/factor,AlexIljin/factor,mcandre/factor,littledan/Factor,tgunr/factor,kingcons/factor,bpollack/factor,mrjbq7/factor,bpollack/factor,nicolas-p/factor,sarvex/factor-lang,slavapestov/factor,littledan/Factor,jwmerrill/factor,dch/factor,mcandre/factor,bjourne/factor,mrjbq7/factor,bpollack/factor,bjourne/factor,ehird/factor,tgunr/factor,Keyholder/factor,bjourne/factor,nicolas-p/factor,bjourne/factor,littledan/Factor,sarvex/factor-lang,slavapestov/factor,littledan/Factor,factor/factor,ceninan/factor,slavapestov/factor,slavapestov/factor,cataska/factor,AlexIljin/factor,ceninan/factor,dch/factor,tgunr/factor,sarvex/factor-lang,cataska/factor,mrjbq7/factor,AlexIljin/factor,nicolas-p/factor,cataska/factor,kingcons/factor,tgunr/factor,seckar/factor,factor/factor,slavapestov/factor,cataska/factor,bjourne/factor,mrjbq7/factor,tgunr/factor