Enable excluding/including chapters and scenes in final manuscript

[QuantumDamage]

Sometimes you are not sure if you want to include whole chapter and/or scene in final manuscript, but you would like to have it in your project anyway for possible future usage. It would be nice to have option to include/exclude every chapter and scene from final project and still work on it in meantime. By default all scenes and chapters should be included I guess. Exclude button could be added next to pencil icon right after chapter/scene title.