Neighborhood has yields and Theater Square adjacency

Added some buffs to Neighborhood and made them give yields like a City Center. Features: 1. Neighborhood and Mbanza give standard adjacency bonus (+1 Culture) to Theater Square. - More people will visit museums if they are close to residential areas. Theater Square also doesn't have much adjacency bonuses so I added one more. 2. Neighborhood provides +2 Food and +1 Production like the City Center. - I wanted to make Neighborhoods work their tile like the City Center because people live there. It's unfortunately impossible so the best I can do is give +2 Food and +1 Production. 3. Mbanza provides additionally +2 Food and +2 Production. Total of +4 Food, +2 Production, +4 Gold. - To take into account that Mbanzas are usually built on Woods, they get +1 Production in addition to what Neighborhoods provide. 4. Allowed Food Market and Shopping Mall to be built together. - Both buildings and the Neighborhood are rather weak so I don't see the point in adding this restriction. 5. Food Market - Added +2 Gold when unpowered, and +1 Gold and +1 Amenity when powered. 6. Increased the Tourism of Shopping Mall from +4 to +6.