Version 1.4.0

For this release I've added a lower cap for the auto-threshold feature, so the script doesn't look below a brightness level of 235 and add weird halation to images that are entirely dark. I've also added a red outer rim to brighter areas, for a more realistic effect. This version also changes the effect boost to a flexible curve model. I've updated all actions, removed the generic ones and brought the monochrome ones up to par.