Winter has come and gone for one of the most beloved “Game of Thrones” characters — but his story’s not over yet. HBO has reportedly entered into early development stages of a Jon Snow-based spinoff series of the Emmy-winning phenomenon based on a series of fantasy novels by George R. R. Martin. Actor Kit Harington, who was twice nominated for his portrayal of the action-hero heartthrob — who went from illegitimate son to potential heir to the Iron Throne without ever sacrificing his morals — is expected to reprise his role, according to The Hollywood Reporter. The controversial season finale …