Deflect Experience, Thanatos EXP Mitigation, and others

Deflect damage reflects back to the boon you used to deflect (kind of, it's a shared experience system since I can't determine which boon is doing the deflecting)
Non-zag killers of things do not get you EXP.
Keepsakes do not level up anymore.
Athena DDs now grant experience on use (and all DD uses, since they still give benefits after the fact)
Artemis Max call is now appropriately tracked.
Fix Clean Kill for real this time? I think the commit got lost somehow.
Fixes a bug where purchasing upgrades in the UI causes a crash

Zyruvias / HadesIncremental