feat(packets): make in non player unknown4, unknown5 optional

feat(packets): add entities and maps packets

fix(packets): make correct fields nullable

feat: split packets definitions into separate assembly

Merge pull request #12 from Rutherther/packets

Implement custom packet serializer

chore: fix documentation

feat: enable inline converters in all packets

chore: renum Morph to MorphVNum

feat: add in packet with all dependencies