Ability, LOS, Settings

Added IsRanged to Ability Class -- Determines how LOS is checked during
target combat.
LOS Checks for units and gizmos has been reduced when object is very
close.
Added MissileDampening Setting for Range Classes which enforces close
range on the unit.
Converted back to simple IsFacing in the ObstacleCheck method
Moved CriticalMass Setting from Funky Settings into the Player Class.
Wizard Archon Destructible power fixed.