Roman Villa Improvement

Adds a new unique improvement for Rome, Roman Villa, It's unlocked at Drama and Poetry civic, and provides you with following bonuses: 1. +1 Food for every 2 adjacent Plantations or Farms (every farm grants +1 Food after Feudalism) 2. +1 Culture if adjacent to City Center or Theater Square 3. +1 Gold for each adjacent Commercial Hub or Luxury Resource 4. +1 Production for every 2 adjacent Pastures or Woods tiles 5. +2 Culture at Natural History civic, and provides Tourism from Culture after researching Flight 6. +0. 5 housing, and cannot be built next to another Roman Villa Works with all Roman leaders, official and alternative Special thanks to CIV VI Modding community.