docs: add missing documentation

feat(packets): make su packet position nullable

feat(packets): add hp, max hp into su and st packets

feat(packets): add many new packets

feat(packets): make skill vnum in su packet nullable

fix(packets): make skill effect in SuPacket nullable

fix(packets): make su skill effect nullable

feat(packets): make position in su packet short

docs(packets): add missing documentation

feat(packets): add entities and maps packets