|SOURCE|
[Common::GameEntity]
* Update is no longer a pure virtual member function, as it will be used for
  controlling the rate of rotation
* Added Move to add velocity to the current position
* Added Rotate to add to the orientation of the entity
[Common::GameStateManager]
* GetTotalElapsedTimeAsFloat returns the total time elapsed since beginning the
  game in seconds
* GetTotalElapsedTimeAsUInt64 returns the total time elapsed since beginning
  the game in microseconds
[Common::GameplayGameState]
* GetActiveActor returns the current actor under the influence of a human
  interface
|SOURCE|
[Common::GameEntity]
* Move defers the movement of the entity until Update is called
[Common::GameStateManager]
* GetTotalElapsedTimeAsFloat renamed GetTotalElapsedTimeAsFloat64