Suggestion: Multipack features

Seeing how the actual packs feels like a correction of older packs by addindg features that shoukd've been present in the older ones makes me think how some features need to be a multipack feature.

Different from crosspack features that only appears when we have two packs woeking together, the multipack feature is a feature that repeats itself in many packs similar to premade apartments and festivals. Some of the features i think should become multipack features are: 

• Singing Skill (City Living): Seasons, Get Famous, Island Living;

• Lot traits (City Living):
- Party Place lot trait: Get together
- Romantic Aura lot trait: Get Together, Romantic Garden, Lovestruck;
- Great Soil lot trait: Seasons, Cottage Living, Enchanted by Nature;
- Penny Pixies lot trait: Discover University, Realm of Magic, Cottage Living and Enchanted by Nature;
- On a Ley Line lot trait: Get to Work, Parenthood and Growing Together;
- Gnomes lot trait: Realm of Magic, Cottage Living and Enchanted by Nature;

• Clothesline (Laundry Day): Seasons and Island Living;

• Education career (Discover University): High School Years and Growing Together.

• Puberty (High School Years): Parenthood and Growing Together;

• Romance consultant career (Lovestruck): City Living

• Plantsims abilities (Enchanted by Nature): Seasons;

• Park worker career (Adventure Awaits): Outdoor Retreat