Replace raw pointers with std::vector / Foam::autoPtr

[MakisH]

We use several raw pointers throughout the code. We should replace them by std:vector (or std::array) or unique_ptr wherever possible.

[MakisH]

For smart pointers we should probably not use unique_ptr: it would be ugly, as we should not use make_unique, which is C++14 (OpenFOAM requires C++11, although preCICE requires C++14, so it probably does not matter).

In any case, OpenFOAM seems to offer similar functionality: autoPtr.H.

Description
    Pointer management similar to std::unique_ptr, with some additional
    methods and type checking.

[TEFEdotCC]

Raw pointers, delete, new, .... etc should not appear in modern C++ as long as needed ;)

[TEFEdotCC]

@MakisH

OpenFOAM requires C++11, although preCICE requires C++14, so it probably does not matter

C++ standard and ABI are different --> So it does not matter which standard you use to build your code. Only the ABI must be compatible. ABI on one Linux system is the same :)

Edit: The target library must be able to read the corresponding interface

[MakisH]

Thanks! My worry is not about ABI, it is about sticking to the minimum requirements of the solver, as we also want to target older systems (usually compute clusters). But again, preCICE already requires C++14, so it does not matter. :)