Generalized, quasi 3D look-up table

[EvertBunschoten]

Proposed Changes

Generalize the variables in the CLookUpTable class for use in general look-up cases (not only progress variable-enthalpy).
Add dimension to CLookUpTable class to allow for quasi-3D interpolation (linear interpolation between two trapezoidal maps stacked in the third dimension).

I added a unit test as a test case with the quasi-3D table to show the correct use of syntax for 3D look-up operations.

Related Work

Can be used in feature_multilayer_perceptron in the CDataDrivenFluid fluid model for look-up operations.

PR Checklist

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[pcarruscag]

Anything else on your side @bigfooted ?

[bigfooted]

Anything else on your side @bigfooted ?

@pcarruscag
I had some small comments, besides that it looks good.
@EvertBunschoten
We can look into generalizing and merging the 2D and 3D LUT approach once the flamelet model is also in develop, but this also means changing the LUT file format. There are some open issues like how to best treat lookups that fall outside of the table, and the extention from the slab approach to the trapezoidal map approach would definitely help with the memory consumption. Not a show stopper right now, but would be nice to do this as part of a student project this year.

[pcarruscag]

Ok you can figure out the order you want to merge things.
LGTM

[bigfooted]

LGTM