* Adds some functions to check if a message is a normal agent message, or a group message.
* Adds new RelativePositionEstimate to complement RelativePosition - RelativePosition actually ends up drifting badly. RelativePositionEstimate instead calculates each time it is requested, using known velocity, and is far more accurate in practice.
* Adds an override to ChatEventArgs.ToString to dump information about the chat.
* Improves reliability of Group Messages
* Teleports previously used GetGridRegion which is sometimes unreliable, request the full map, once, if it fails. The results will be cached.
* Adds AgentManager.LastPositionUpdate to tell you when the avatars position was last updated
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