<MPL> changed MPL::IdealGasLaw behaviour

The molar mass as a necessary element of the IdealGasLaw function is now stored and passed in the VarialbleArray. Previously, the Molar Mass was passed via an MPL function, which could lead to overly complex code, especially if the gas in question was a mixture of several components. With the new implementation, it should be noted that the molar mass must now be written into the VariableArray directly before calling the Density property in the local assembler.

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changed milestone to %6.4.1

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• 38e925cf - <MPL> add VariableType 'molar_mass'
• 8b785511 - <MPL-related> changed MPL::IdealGasLaw behaviour

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assigned to @wenqing

Code changes looks good!

In MaterialLib/MPL/Properties/ClausiusClapeyron.cpp there is also a molarMass method. Is it possible to substitute the molar mass in ClausiusClapeyron in the same way it is done in IdealGasLaw? Could be done in a separate MR.

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mentioned in commit fbf2e503

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