Started consolidating PKMNsim->impl library Pokemon conversion functions into single file

* Working (but hacky) converter from pokehack structure to spec_pkmn
* TODO: figure out how to get rid of friending impl functions in interface headers
conversions: completed pokehack_pkmn_to_spec_pkmn
Transferred pokelib_pkmn_to_spec_pkmn from trainer_gen4impl.cpp to conversions.cpp
Added PKMNSIM_API to database/queries.hpp
conversions: implemented spec_pkmn_to_pokehack_pkmn()
conversions: removed unreferenced local variables
Merge branch 'pokemon_conversions'