Decoupled 2p2c fluidstate can entail the 3p3cfluidstate:

-Members are no longer private but protected
-Converted Arrays to Dune containers for variables that are used in complex 3p3c flash calculations (eqilibrium ratios and phase mass fractions)
Simplified temperature acess function by default argument since only one equilibrium temperature for all phase is available.
reviewed by Bernd

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