room entities #85

in my autistic need for comprehensive nonsense, I figure I may as well keep track of rooms and things.

struct Room {
    id: RoomId
    name: String,
    episode: Episode,
    created_by: CharacterEntityId,
}

enum RoomNoteDetail {
    PlayerJoined(CharacterEntityId),
    PlayerLeft(CharacterEntityId),
    QuestStarted(QuestId),
    ...
}

struct RoomNote {
	note: RoomNoteDetail,
    timestamp: chrono::DateTime<chrono::Utc>,
}

then to go with this add room_id to ItemNoteDetail::EnemyDrop (as well as monster: MonsterType cause whynot)