MHD/Hybrid Simulator merging

[UCaromel]

A few things about this merging:

• the instantiation of all the possible parameters for MHD (in file cpp_mhd_parameters.hpp) takes a lot of compilation and link time.
• the current implementation can be improve iterating over the enums for selection directly instead of a tuple of them.
• there might be some hidden cost in these loops i am not able to explain (for example having a return condition in the loops instead of the declaring function themselves seems a lot slower).

Room for improvements i can think of:

• Resistivity and hyper-resistivity can be de-templated easily and likely with little cost on runtime performance.
• Hall is trickier but likely doable.
• We can probably limit by default a single time integrator designated to each spacial scheme (reconstruction).

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