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
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
fix(packets): make st packet buff vnums a read only list instead of list
chore: update dependencies