Facade_Engine: UniqueAdjacency Method that Returns FrameEdge

#### Description:

For facade thermal calculations the frame/mullion thermal performance is dependent on the adjacent construction on either side. To perform a detailed thermal calculation for a whole facade we need to be able to assign FrameEdgeProperty and frame u-value based on each unique adjacency condition.

The current UniqueAdjacencies method is able to identify these conditions from a collection of openings but does not return the FrameEdges in a way where properties and u-values can be assigned to each unique adjacency. For the thermal calculation workflow to work we need this method updated or a new method that returns a list or index of the input frame edges organized by adjacency type so u-value can be assigned accordingly.