Allow Called Shot modifiers to be read from a table

@bloodydoves requests that the CalledShot attack modifier be definable in a table, instead of just computed from SkillUtils. The same semantic and normalized skills are fine, so a 3-row table will be necessary to house the values from 1-13.

Locate the CalledShot attack modifier and the SkillUtils code that currently computes it. Inspect how semantic and normalized skills are represented, then define the requested three-row table for values from 1–13 and verify that Called Shot reads from it instead of only using SkillUtils.

Written by the indexing model from the issue text.