add base class for savable classes

devTools/FC.d.ts

src/002-config/Savable.js

src/004-base/arcologyBuilding.js

src/arcologyBuilding/apartments.js

src/arcologyBuilding/base.js

src/arcologyBuilding/manufacturing.js

src/arcologyBuilding/markets.js

src/arcologyBuilding/penthouse.js

src/arcologyBuilding/shops.js