Getting Started IX: Damage and XP Distribution

Damage terms, world difficulty, combat XP, and the custom Aurbis skill curve.

Combat XP now uses custom Aurbis XP: damage * 0.11, clamped from 0.55 to 11 XP per accepted combat damage row.
Aurbis skill curve is custom: xp_to_next = 90.45 * 1.05^level + 180 * max(0, 1 - level/50).
Vanilla use XP for combat skills is customized for One-Handed, Two-Handed, Archery, Block, Heavy Armor, Light Armor, Alteration, Conjuration, Destruction, Illusion, Restoration.
Standing Stone permanent skill gain multiplier is configured as 1.2x with The Lover 1.15x.