Updated project for SDK 3.6 changes.
Improved the RacetrackFactory class.
Improved logic of addEntities() method in RacetrackFactory.
Improved the signature of the addEntities() method and further improved
the logic for random entity distribution modes.
Added support for entity cluster distribution to addEntities().
Added support for entity thinning multiplier with that the density of
entities can be controlled with a single value. This makes it easier to
automatically decrease the entity count on lower-spec platforms.