message: Use constant for SolarPlant power production
diff: #include "../../Constants.h"
  +const int SOLAR_PLANT_BASE_PRODUCUCTION = 2000;
  +
  class SolarPlant : public Structure
  {
  public:
  @@ -18,6 +20,6 @@ public:
  protected:
  void defineResourceOutput() override
  {
  - resourcesOut().energy(2000);
  + resourcesOut().energy(SOLAR_PLANT_BASE_PRODUCUCTION);
  }
  };
  