getXPMultiplier
Calculates XP multiplier based on level difference. Mobs more than 5 levels higher give XP as if they were only 5 levels higher. Mobs below combat level have no combat-level lower boundary; individual skills apply their own lower-bound checks when XP is awarded.
Return
XP multiplier from 0.0 to 1.0
Parameters
player
The player
mobLevel
The mob's level