Add starting gold for ACG classes
ACG add weapon groups

These are needed for Swashbukler Finesse class ability and Slashing
Grace feat.
Lots of work

Implement Shaman class. Implement slashing grace feat. Implement
arcanist greater exploits. Fix swashbuckler class skills. Fix
investigator class skills. Fix investigator weapon and armor
proficiencies. Fix arcanist energy shield. Fix warpriest bonus feats.
Update TODO file.