Update Const.cs adding few new constants regarding the newly added ProjectBlueprint

    public const string FilmBlueprintSlot = "film";

    public const string VideoAnnotationBlueprintSlot = "video-annotation";

    public const string CoverPhotoBlueprintSlot = "cover-photo";

    public const string BTSPhotoBlueprintSlot = "bts-photo";

    public const int CoverPhotoMinCount = 1;

    public const int CoverPhotoMaxCount = 5;

    public const int LemmaCoverPhotoMinCount = 2;

    public const int BTSPhotoMinCount = 0;

    public const int BTSPhotoMaxCount = 5;

    public const string SystemName = "System";