Getting rid of nested TurnIntoList nodes - second batch

[andydandy74]

Episode 2 of the ongoing effort to get rid of TurnIntoList and ReturnListOrSingleValue:

• [x] All Families of Category
• [ ] All Intersecting Elements Of Category By BoundingBox
• [x] AreaSeparator.FromCurve
• [x] Assembly.AddMembers
• [x] Assembly.FromElements
• [x] Assembly.RemoveMembers
• [x] Document.AddLink
• [x] Document.ProjectParametersByCategory
• [x] Element.CopyByVector
• [x] Element.CopyToLevel
• [x] Element.Location+
• [x] Element.Materials+
• [x] Element.ResetSlabShape
• [x] Element.SetMaterialParameterByCategory
• [x] Element.SetType
• [x] Element.SetWorkset
• [x] FamilyInstance.ByPointInView
• [x] FamilyInstance.CopingElements
• [x] FamilyInstance.HandOrientation
• [x] FamilyInstance.SetLevel
• [x] FamilyType.Duplicate
• [x] FamilyType.SetCompoundLayerMaterial
• [x] GroupType.Groups
• [x] Material.Duplicate
• [x] RevitFace.FromDynamoSurface
• [x] RevitFaceReference.FromDynamoSurface
• [x] Room.Finishes
• [x] RoomSeparator.FromCurve
• [x] Sheet.PlaceholderByNumberAndName
• [x] SpaceSeparator.FromCurve
• [x] View.SetDesignOption
• [x] View.SetPhase

[andydandy74]

To be continued in #415 ...