entities support #42

check all current entity packets are handled impl {"entity_velocity":68894,"sound_effect":26864,"rel_entity_move":4277,"entity_head_rotation":2851,"entity_metadata":2020,"entity_move_look":2005,"teams":1700,"entity_teleport":1386,"entity_look":1017,"ping":1010,"entity_update_attributes":593,"player_info":402,"update_time":252,"animation":251,"entity_equipment":237,"entity_destroy":151,"named_entity_spawn":127,"update_light":64,"set_slot":57,"block_break_animation":42,"map_chunk":36,"spawn_entity":22,"world_particles":16,"keep_alive":16,"chat":11,"playerlist_header":5}