feat(core): split raw client and managed client as well as packet handlers

Resolves #65

fix(core): do not throw an exception when adding IEveryPacketResponders

fix(core): do not add packet responder multiple times

Merge pull request #55 from Rutherther/feat/contracts

Add contract system

feat(core): add basics of a contract system

chore: move PacketSerializer types to correct namespace

feat!(core): make some classes internal

feat(core): add command pre and post events

fix(core): correctly log full exception error

feat(core): add stateful entities support

Supports injecting entities depending on the current nostale client.
Useful for remote, pipe client etc.

feat(core): add pre and post responder events

feat(core): add walk command for moving the player as well as pets simultaneously

feat(core): add command for taking control

Allows only one silmutaneous action in the given group, user cancellable

feat: add possibility to convert error results to string

Merge pull request #12 from Rutherther/packets

Implement custom packet serializer

chore: remove NosCore dependency

feat: update result logging mechanism

feat: add support for logging nested results

chore: fix line endings

Merge branch 'in-packet-serialize' into 'main'

Serialize IN packet

See merge request Rutherther/nos-smooth!3