chore: update versions

feat(game): handle null skill vnum in su packet responder

fix(game): create character on at packet received

fix(game): make effects vnum short instead of long

chore: bump versions to support new PacketSerializer

chore: update Game

chore: move PacketSerializer types to correct namespace

Merge pull request #32 from Rutherther/combat

Add combat extension

chore: update versions

fix(game): create npc instead of monster in InResponder

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

chore: update dependencies

feat(game): respond to skill use packet sent from the client to set cooldown early

fix(game): set health to 0 on entity death

fix(game): do not replace character with player in map entities

chore: update to .NET 7

feat(packets): merge send and receive packet handling to one method

chore(core): update version

feat(core): make command handler not found error

feat!(core): make some classes internal