feat(core): add contract builder outline

feat(game): add every game event responder

feat(core): add basics of a contract system

fix(game): make current partner and pet null if pinit does not contain them

chore: use specific errors instead of GenericError

chore: add async analyzer and meet its standards

fix(game): respect family sub packet nullability

chore: update versions

fix(game): parse null inv sub packets correctly

chore: update versions

Merge branch 'main' of github.com:Rutherther/NosSmooth

Merge pull request #52 from Rutherther/feat/optional-wrapper

Add optional wrapper

docs: add not in range, nullable wrapper docs

Merge pull request #51 from Rutherther/feat/easy-api

Add easy apis for various things

feat(game): register apis to service collection

feat(game): add mate skills api

feat(game): update skills api to allow using skills on self (character)

feat(game): add inventory api

feat(game): add inventory api

feat(game): add api for mates (company, stay, send back)