Ability -- Clusters

Added Fbuff to Ability which is used to test for buffs out-of-combat.

Added new ClusterCollection Class -- used in ability clustering.
Ability

Removed Gold/Globe/Gizmo/Item out-of-combat ability selection. (Was
causing issues with looting)

Replaced logic for Barb Abilities: Overpower, Rend,
Target Clustering

Target Clustering is now a ClusterCollection Class.

Fixed out of bound exception during cluster UpdateUnitPointLists Method.