docs: add missing documentation

feat(packets): add buff, chat, raid, teleport, mates control packets

fix(packets): add unknown fields to sc_n packet

Merge pull request #45 from Rutherther/feat/mates

Add support for mates

feat(packets): add nullable wrapper to represent a compoud type that may be null as a whole

chore(game): add missing documentation

feat(game): add mates processing

feat(packets): add many new packets