|SOURCE|
[Common::Actor]
* Added maximum velcity for the actor (which will be actor-specific rather than
  global)
* Move direction enum added for the actor to move along
[Common::GameplayEvents]
* MoveEventData
  * Contains the actor, direction, and velocity for a move event
* MoveEvent
  * Agent movement is sent via this event
* GameplayInputListener
  * HandleEvent translates an input semantic for movement into a move event
[Common::GameplayState]
* Added an instance of the GameplayInputListener
* MoveEventType and SemanticInputEventType added to the list of event types the
  GameplayInputListener will listen for