Refactoring, Skill Criteria, LOS Behavior, Misc

Refactored Behaviors: OutOfGame, Item ID Behavior, Town Portal, and Game
Mule into DBHandlers.

Skill Criteria for Precast and Single Target now create the criteria
from the constructor.

Line of Sight movement should nullify target more often now.

Fixed Potion being sold during town run on first run.

Added item looting confirmation for stackable items.