Invalid extends of operator record as record

[maltelenz]

Here:

IDEAS/IDEAS/Experimental/Electric/BaseClasses/Types/ComplexCharacteristicImpedance.mo

Lines 2 to 4 in a9cc4fd

	record ComplexCharacteristicImpedance = Complex (redeclare
	CharacteristicResistance re, redeclare
	CharacteristicReactance im) "Complex Characterisitc impedance";

we have:

Invalid extends-clause. ComplexCharacteristicImpedance is a record and Complex is an operator record, but a record cannot extend an operator record.

according to the table in 7.1.3 of the specification: https://specification.modelica.org/maint/3.6/inheritance-modification-and-redeclaration.html#restrictions-on-the-kind-of-base-class

[jelgerjansen]

@maltelenz thank you for addressing this Modelica specification violation.
The IDEAS.Experimental.Electric package dates back almost 10 years and should be removed in a future release. Instead, the IDEAS.Electrical package, which we inherit from the Modelica IBPSA library, can be used to model electrical components.
However, I still fixed this issue through #1472.