DNC AF/Relic & SCH Arts Fix

Implemented Dancer AF and relic pieces that weren't implemented yet (at
least up to 75).
Fixed Dark Arts/Light Arts so that they give the proper skill bonus to
raise the players skill from D to B+ (not just the skill maximum).

I've tried to squash these commits down, and rebase them, but I'm kinda at a loss. I guess the lesson is don't make commits 6 days apart...