Entrypoints
add_energy
add_mutable_attribute
add_xp
balance_of
mint
remove_energy
remove_xp
set_administrator
set_lvl_map
set_marketplace
set_max_energy
set_max_stats
set_max_xp
set_metadata
transfer
update_added_mutable_attribute
update_game_manager
update_metadata_list
update_mutable_attribute
update_operators
withdraw_mutez