tools/bechmark.lua: Add -filter option. refactor
tools/bechmark.lua: Add -filter option. refactor

higankanshi/waifu2x,nagadomi/waifu2x,vitaliylag/waifu2x,zyhkz/waifu2x,vitaliylag/waifu2x,zyhkz/waifu2x,higankanshi/waifu2x,nagadomi/waifu2x,higankanshi/waifu2x,zyhkz/waifu2x,vitaliylag/waifu2x,nagadomi/waifu2x,zyhkz/waifu2x,nagadomi/waifu2x,Spitfire1900/upscaler,Spitfire1900/upscaler,nagadomi/waifu2x