SimpleNLayer: Add Dynamics and T_start as vector

What is the problem?

• The model AixLib.ThermalZones.HighOrder.Components.Walls.BaseClasses.SimpleNLayer cannot use defined energyDynamics
• T0 is not a vector --> Currently, all layers will be initialized with the same temperature
• T0 should have the name T_start

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

• Add dynamics like in AixLib.Utilities.HeatTransfer.CylindricLoad
• Provide conversion script for refactoring T0 to T_start
• Raise AixLib version number