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Use wall record directly in `AixLib.ThermalZones.HighOrder.Components.Walls.BaseClasses.SimpleNLayer`

What is the problem?

Distinguishing between selectable record and single parameters is not necessary
if-else nesting due to TIR and TMC in HOM model is not necessary. Use Record with wall types would be beneficial

How do we want to solve it? Describe the solution you'd like

Delete selectable in AixLib.ThermalZones.HighOrder.Components.Walls.BaseClasses.SimpleNLayer and according models
correct if-else nesting in HOM building and introduce a collection of wall types instead. Use if-else only on building level to select the record, which contains multiple wall records.

Further tasks

Create PartialRoom model
Compare changes to reference results
Create (old) reference results and merge branch issue752_createHOMRefResults as soon as #893 is merged into development