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Issue created by Kilian Weishaupt@kweisMaintainer

Add concepts for PrimaryVariables and SwitchablePrimaryVariables

Using concepts (!1902 (closed)) would probably lead to a more concise syntax at many places dealing with PrimaryVariables.

PrimaryVariables:

  • [ ] operator
  • scalar-valued entries

SwitchablePrimaryVariables

  • PrimaryVariables + state()