parameter class

[CagtayFabry]

Create base class for parameters. This class should represent nominal value (e.g. power source settings but also general metadata).
Parameters can be time dependent by default (see below)
All values should be Quantity (dimensionless allowed)

time dependency

• provide interp_time functionality
• define custom interpolation behavior (step,linear,spline ...)

implementation variations

• single quantity value without time for constant values
• quantity array + time (as pd.Timedelta or pint.Quantity) + interpolation style
  • time dependency implemented as xarray.DataArray with time dimension
• MathematicalExpression with single undefined time parameter