io: fixed import
conversions/pokemon: minor Pokehack nickname code cleanup
bag: added cases for X and Y (matches Gen 5 games)
Overhauled database usage to improve efficiency

* Implementation classes have static SQLite::Database members
* Source files with database-related functions have static databases
* Removed unnecessary SQLiteC++ includes
io: fixed EV/IV special imports
io: added moves to import_from_pksql
database/queries: added get_move_pp
Merge branch 'master' into nds_wifi
conversions/pksql: added move PP to pksql_to_pokehack_pokemon