Refactor/Remove Pose::translateY()

[Try]

translateY is hack to workaround difference between OpenGothic and Vanilla:

in OpenGothic logical center of npc is in between foots, for sake of making ground collision easier
in Vanilla logical center is same as geometry center and game relies it in swim and climb mechanics

• align center of npc location to Vanilla
• ensure save-game compatibility
• remove code related to +/- translateY()
• implement correct ray-box intersection for arrows