Changed folder name from "occultist_P" to "27occultist_P" according to Anti_Cow's folder naming convention for heroes.

See more about this research at → https://www.reddit.com/r/darkestdungeon/comments/ccp2z5/skin_name_conflict_for_heroes_is_gone/

- More consistency between the different sprites (specifically in the collar area)

- Still trying to eliminate all of the lost (flashing) pixels; plenty more fixed on the idle, walking and combat animations

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Minor sprite improvements and reworked Workshop preview picture