Create systems for managing data

We need systems for managing and storing data. Data includes:

• Information about player's resources
• Information about ongoing and already held events
• Information about the city

For this we need to first update the UML diagram to include the following structure:

• DataStorage - stores all the information about player's resources and player's city. Includes the following fields:
  • money - to represent player's balance
  • citizens - represents player's city citizen count
  • popularity - represents city's popularity
  • buildings - array pf small, easy-to-save containers with data about all buildings in the city
  • events - holds the log of events already held by the player
  • quests - holds identifiers of active quests, (maybe) holds progress on these quests
• EventManager - responsible for managing the events.
  • Provides API to start events
  • Notifies about event's progress
• City - holds information about the city.
  • References buildings directly so other entities can access them
  • Can dump all placed buildings into an easy-to-save container for DataStorage
  • Provides APIs for placing buildings, checking space availability, and removing buildings.