fix(packets): make generator work with packets that have 0 members

fix(packets): make UpgradeRareSubPacket converter work with "0"

fix(packets): make bs packet effect id nullable

chore: update versions

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

fix(packets): add header for st sub packet

chore: bump versions to support new PacketSerializer

chore: update PacketSerializer version

fix(packets): add missing usings

feat(packets): do not add the same packet multiple times

chore: move PacketSerializer types to correct namespace

feat(packets): add support for st buff vnums with levels

Merge pull request #32 from Rutherther/combat

Add combat extension

chore: update versions

fix(packets): parse 0 UpgradeRareSubPacket as 0, 0

fix(packets): Add new unknown field to ski packet, make rank of SkiSubPacket optional

fix(packets): make skill effect in SuPacket nullable

fix(packets): make su skill effect nullable

fix(packets): correctly use cast id instead of vnum in UseSkill packet

fix(packets): make correct fields in drop packet