Post-1.2.318 Damage Calculations

Consolidating what we know so far:
- Weapon Attack is still proportional to damage
- Minimum damage is obtained from maximum by straight multiplication by mastery
- Base mastery depends on weapon and skill mastery adds to it
-- Guns are 15%
-- 15% ranged, 20% melee, 25% magic?
- Base critical rate is 5% and skill critical adds to it
- Physical and magical "rate" acts as a penalty modifier, such that PDRate = 10 reduces physical damage by 10%
- Magic Attack is now proportional to magic damage and separate from INT, which makes magic damage similar to physical damage
- Magic Attack is partially dependent on LUK
- Physical and magical avoid are now separate entities