Stronger actor association typing in AP functions

server/controllers/activitypub/inbox.ts

server/lib/activitypub/actor.ts

server/lib/activitypub/audience.ts

server/lib/activitypub/playlist.ts

server/lib/activitypub/process/process-accept.ts

server/lib/activitypub/process/process-announce.ts

server/lib/activitypub/process/process-create.ts

server/lib/activitypub/process/process-delete.ts

server/lib/activitypub/process/process-dislike.ts

server/lib/activitypub/process/process-flag.ts

server/lib/activitypub/process/process-follow.ts

server/lib/activitypub/process/process-like.ts

server/lib/activitypub/process/process-reject.ts

server/lib/activitypub/process/process-undo.ts

server/lib/activitypub/process/process-update.ts

server/lib/activitypub/process/process-view.ts

server/lib/activitypub/process/process.ts

server/lib/activitypub/send/send-accept.ts

server/lib/activitypub/send/send-announce.ts

server/lib/activitypub/send/send-follow.ts