[newchem-cpp] Refactor such that SpLUT is implemented with XMacros

[mabruzzo]

This PR was originally proposed as brittonsmith#27

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This PR must be reviewed after #333 is merged

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Previously, the SpLUT was implemented as a manually maintained list of all possible primordial, metal and dust species.

This PR consists of 4 commits:

1. I renamed the members of SpLUT corresponding to dust grains so that they are more consistent with the names tracked in grackle_field_data. For the sake of consistency, I made the same modification to members of OnlyGrainSpLUT
   • SpLUT::SiO2D is now SpLUT::SiO2_dust (be aware, this is distinct from the SpLUT::SiO2 entry)
   • SpLUT::reforg is now SpLUT::ref_org_dust
   • SpLUT::volorg is now SpLUT::vol_org_dust
   • SpLUT::H20ice is now SpLUT::H2O_ice_dust
   • all the other dust-grain name entries now end in _dust (e.g. SpLUT::SiM is now SpLUT::SiM_dust)
2. I divided grackle_field_data_fdatamembers.def into 2 files.[^1]
   1. field_data_evolved_species.def contains all species fields that are evolved by grackle. In other words, these are the primordial species, dust species, and grain species (these all have corresponding entries within SpLUT
   2. field_data_misc_fdatamembers.def contains all of the other fields
3. Finally, I refactored SpLUT to actually make use of the XMacros from field_data_evolved_species.def
4. I started allowing clang-format to format src/clib/LUT.hpp