fix arbitrary width webtoons

adjust webtoon edge detection threshold

adjust webtoon thresholds

make webtoon faster/more accurate (ciromattia#1117)

disable autocontrast

fix webtoon panel detection by doubling max height (ciromattia#1115)

forcecolor

Differentiate source directory is empty errors (ciromattia#1113)

add edge detection

Merge branch 'ciromattia:master' into webtoon-large